This is an interesting question. If would dismiss it as not remotely possible, if it wasn’t for the fact that what has happened I never considered remotely possible!
That said, I don’t think the scenario of bitcoin sucking up the worlds wealth, in an out of control feedback loop is possible.
There are a bunch of aspects of Bitcoin that will make its price growth self limiting.
Mostly, these stem from the fact that any “return” from bitcoin “investment” is simply a transfer of tokens from one entity to another. If I have $14k and you have this valuable bitcoin, when we trade, the tokens just switch owners.
If 1 bitcoin reaches $1m , and price is stable, why would I buy it? Maybe it has utility as a way to move large sums, where it is converted back to fiat. Or a way to protect my wealth from inflation (which means its price is going up).
If price is going down, it would be crazy to invest large sums of real money in bitcoin, as it has little real utility. This will be the driving force of a collapse.
I’m not putting my finger on it, but there just doesn’t seem to be any reason that a large percentage of the population is going to hand their wealth over to another arbitrary portion of society. The reason people are doing that now is because they are speculating on the fiat price of a digital token, in the hopes of “making money”. This is only possible under the kind of parabolic price growth we see now, which can’t continue I definitely.
That said, there are huge sums of money looking for places to invest, so this could continue a while. There seems to be a quirk of human social psychology that makes participation in financial bubbles universally popular.
This has nothing to do with interest in bitcoin actually being turned into currency. It’s kind of the opposite, they are hoping bitcoin will turn into more of what they really value, which is the coin of their realm.
Edit: There is also a hugely vulnerable system to try and realize any gains. Reddit is starting to fill with users complaining of losses due to flash crashes, and exchange breakdowns. Neither the exchanges nor the blockchain networks will be able to handle a “rush to the exits”.
It’s not possible for most people to realize “paper gains” in zero sum system, and I predict there are going to be crazy stories of huge wins and losses, when a crash comes, due to forces outside of anyone’s control.