if it happened that all the money in the world went into the crypto market, in my personal opinion, this would be a problem for bitcoin, because there is no more freedom, what is certain is that if it did happen, it would definitely be controlled by the rich, and those who have power, so my movement as a middle class person will find it difficult to compete with people who have power, and have wealth, I think this is a bad idea..
If Bitcoin is widely adopted, then whales would have less control over the value because they would own a much smaller portion and they would have no control over the payment system like they do now.
If all the money into the world entered the cryptocurrencies I do think that would be extremely unstable.
The value of a bitcoin would be no less stable than any other currency if it were widely adopted.
Although it's only an if situation because we know that it will never happen because there are other investment assets that will remain to be a high option for most investors.
As Bitcoin is widely adopted, its price will stabilize, and it will be no more investable than any other currency.