It's already much harder to move the price of BTC: and it slowly will become harder and harder for institutions too, in my opinion.
A lot of bitcoin is concentrated in the hands of a few. Take Blackrock and all the ETFs or MicroStrategy, for example. They have what it takes to move the market. Bitcoin is a collateral for one type of bonds that MicroStrategy is selling to investors. If it becomes necessary to sell a big chunk of it due to a downward trend, it would cause a lot of panic selling, with other individuals and companies dumping their bitcoin.