In retrospect I'd say Bitcoin started as a really cool idea but is now on its way to become something sinister. Because the USDs you now invest in Bitcoin probably go to a drug lord or a cyber criminal. This use and speculation ultimately drive the Bitcoin value. I can't see it as an utopian currency for the "common man".
Common men need a stable currency which can be used to reliably pay the rent or buy food. The use of a currency must be simple and understandable. A currency must be accepted everywhere in its region. A real currency is closely related to a "real" national economy and thus backed by real work.
Nothing of this applies to Bitcoin. A national economy based on Bitcoin would collapse due to deflation, i.e. everyone would keep clinging to their precious Bitcoins because they still rise in value. That's the reason why central banks try to avoid deflation at all cost.
If I were you I'd sell my Bitcoins and get a nice apartment in Manhattan. Because Manhattan will still exist in 20 years.
Let me try to "spin" some of the issues:
1. USD -> "drug lord or cyber criminal": In the USA, the biggest gateway between USD and Bitcoin is Coinbase.com. To transact through them, you need to provide all the information banks request when you open an account. They also place a relatively small max $/day that can be withdrawn [$10,000 USD]. If you are a criminal, you probably do not want anything to do with Coinbase.
2. "crime and speculation driving BTC value": There certainly is a lot of speculation going on in BTC. Bitcoin has also been used by criminals. Bitcoin is not great for criminal activity due to the fact the ledger is public and organizations like FBI are getting better at being able to trace Bitcoin payments. Long term, Bitcoin will not be the coin of choice if you need absolute privacy. [There are some privacy focused coins like Monero, Cash, DASH. <= These coins are impossible to trace sender, receiver, amounts.] Bitcoin did gain noteriety by its use on Silk road and the dark web but this is no longer a primary use-case.
Speculation -> increased volatility -> less stability. This is a real problem. Volatility should decrease over time as the distribution of BTC spreads over a much greater % of the population.
3. "Common men need a stable currency to pay rent\food": This is a big problem right now. Bitcoin may never become a "transactional currency" for small purchases. There are other coins vying for that role [LTC]. Bitcoin may be happy to become just a "store of value" for long-term wealth preservation. [However, the number of merchants accepting Crypto as payment increases every day. My kids' violin teacher is considering accepting BTC\LTC]
Do you remember when working people "saved for retirement"? Over the past 20-30 years the term "save" has been slowly replaced with the word "invest". People now need to "invest for retirement". Is that a big deal? Yes. [For many reasons]
1. Most people know nothing about investing
2. Most traditional investments offer greater rewards to wealthy individuals and middle income people just get scraps.
3. Traditional assets are manipulated to a point avg people can not make real long term predictions.
This gives Bitcoin a possible wealth preservation role in long-term portfolios. [In 20+ years once the exponential growth finishes.]
4. "It needs to be easy": Crypto is currently fairly complicated to use but new products are appearing to make crypto as easy to use as debit cards\paypal\cash. Older people may not get involved but younger people [and future generations] will likely view Bitcoin\Crypto in the same way we view ATM\Debit cards [My mother is in her 70's and refused to have an ATM card until this year (she would carry $600-$1,000 in cash whenever she took a trip)]
5. "Currency must have universal acceptance in a geo area": Unfortunately, even the mighty USD is not accepted at every merchant in the USA. [I was on a flight and they would only accept VISA as payment for drinks (I do not drink but felt like it was a scam to not accept cash)]
6. "A real currency is backed by real work": That is a great utopian view on central bank issued \ debt backed currency. How many trillions of USD are created by speculation on the financial markets? Is that "real"? Every bitcoin created takes substantial investments into the real economy. [CPU, GPU, Electricity, Realestate, Salaries etc.....] Also, Crypto market is rapidly expanding in terms of new companies creating new products with real world applications.
7. "national currency can not be deflationary": True. The Fed needs to constantly print USD so people can keep up with interest on debt payments. This QE\0% interest rate steals wealth from savers and hands it to speculators\materialists. I am not going to suggest that BTC will replace USD in my lifetime. However, in time the price of BTC should start to level out to the point that predictable price increases will replace the current "highly volatile exponential growth" period. At that point, people will not feel the need to "cling" to BTC and should be thought of an asset class like gold. [My home was purchased with gold. I can see a day when people will "save" in BTC for large purchases like homes\education\retirement. Right now how can people "save" for a 20% downpayment on a house when home prices increase >> wages\inflation & interest rates on savings are 0%?]
8. "buy a nice condo in Manhattan": I've looked at nice places in Manhattan and.... too much $.... Also you never really own real estate in the USA. You are simply renting it from the government. If you think that is not true.... try not paying your property taxes. The government will sell your property to somebody else.
You made some good points about the current issues with Bitcoin. As you can see, I am optimistic that many of the current problems will get solved and adoption will continue to speed up. If I am wrong... well... I'd by lying to say I will not be greatly disappointed.