Whether there are enough people or not crypto will never become stable. That's why it is decentralized and I did mentioned it already, you can't expect something to be stable if there's no one controlling it. We don't care about those trades that are happening with EUR or USD. They have their own market so bitcoin does have its own too. And for those people that keeps on talking like a child and thinks that they are very well professionals with cryptos and says that its the end of bitcoin, just forget about them.
It has nothing to do with being controlled. The more buyers/sellers, the more stable, and that's obvious.
Do you think you can pump & dump BTC like you can do with an unknown coin? No. It requires much less money to pump & dump a shit coin with nothing in its order book.
As soon as a currency or share is in the hands of many people, too many for them to organize pumps or dips, then it stabilizes, because sells have way more chances to find a matching buy.
And if you think that BTC will never become stable, then it has absolutely zero chance to become an actual, used currency. You can't do ANYTHING with a currency that's not a minimum stable. You can't make a business work, you can't lend, you can't use it for your salary, etc. Can't buy goods for your store at a price and find out that no one will buy them over half the price you paid, because that month the currency has crashed. You can't get paid in BTC and the next month not be able to pay your rent & your food because of a massive pump.
You do sound like the child here, it's obvious to everyone that volatility is related to how big/supported the thing is. Yes, governments can & do control values, but to keep things stable at another level. Without governments, don't think that eur vs usd would suddenly crash or pump anywhere like crypto does. The markets are waaaaay too big for that.
Same thing with shares. Tiny company X launches an amazing product, it can pump 10x. Large company did something bad, its shares will lose 5% and even that will be considered a problem.
Which doesn't even mean that something like gold can't pump 5x, it can and it has, but that spreads over many years. Too many people have trust in gold for it to have any chance to crash like a crypto. You know why? 8 trillions vs 160 millions, that's the difference between their market cap.