The hard part has always been to get real money out again.
That's just bullshit. Anyone can open an account on a cryptocurrency exchange and start trading. It works the same as trading stocks on your brokerage account. You can sell your crypto and withdraw the money to your bank account at any time. The liquidity for Bitcoin is staggering, your baseball collection card comparison is moronic and completely off the mark.
Dollars can be printed widely enough that everybody who carries out economic activity can have one. (...) The fact that the[y] slowly devalue means that the link to economic activity is maintained and maintainable.
As you point out, the system of fiat currencies have inflation built in, but that is at odds with its function of fairly bookkeeping ones' reward for their economic activity. Money replaced barter and enabled quantification of economic activity as well as storage by carrying some portable token (seashells, beads, gemstones, coins, banknotes, silver, gold) enabling easy storage and deferring of receiving ones' reward. Most tokens turned out to be woefully inadequate because they lacked scarcity. And today when stored in modern day fiat, the compensation received also slowly melts away over the years for the same reason: lack of scarcity which we call monetary inflation and which is built straight in to the system.
To at least keep up with the inevitable inflation, people will have to invest their fiat. That in and of itself is not a bad thing during times of moderate real inflation*, but if real inflation becomes like over 4% then this causes significant adverse economic effects such as overheated real estate markets and incentivizing investments in uneconomical businesses -- after all losing 2% is still better than losing 4%. This ties up human labour into uneconomical activities, which the world has recently witnessed during the times of near-zero interest rates where at the same time the monetary inflation was sky high because of QE programs. One of the ill effects that the world witnessed was a flood of unprofitable VC funded startups that didn't have any viable business plan, but which tied up people doing unproductive labour even causing labour shortages which hurt existing viable businesses.
Bitcoin offers an alternative means of storing ones' wealth. At face value it's better suited than fiat in the sense that the supply of Bitcoin can't be artificially inflated over its preprogrammed schedule unlike fiat which can and often actually ends up getting debased by its meddling government. Bitcoin is also a better gold in the sense that it is cheaper to safely store, transport and transfer, impossible to counterfeit, and unlike gold has a predictable, known and fixed supply. The obvious quality missing is that Bitcoin hasn't proven its worth and stability over centuries, unlike gold, which is why it is still a hugely volatile asset. Only time will be able to fix that. The signs are good -- volatility has already decreased significantly since its inception 15 years ago.
So, Bitcoin definitely has a place in the world. Perhaps not to replace fiat altogether, but definitely as an alternative way to safeguard ones' wealth and to keep it isolated from economic meddling by governments.
*real inflation: price inflation minus the risk free rate. So if price inflation is 6% but risk-free you can earn 2%, then the real inflation would be 4%.
The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth. -- Niels Bohr