What would happen? If in the future ETF holders become the 99% and 1% are self-custodians,
In a scenario where almost nobody owns bitcoin and things have gotten this centralized, we can say with confidence Bitcoin is already dead so who cares what happens!
then it will be on their interest to push this agenda. What if they have enough % of developers under their payroll, and enough people supporting it because they lost their money, and start pushing for a hard fork? What would be the game theory outcome scenarios at play here?
They'll need to get high percentage of the hashrate on their payroll and a high percentage of the community that includes full nodes, bitcoin users and the economy built on top of bitcoin.
Immutability is one of the fundamental principles of Bitcoin, people aren't gonna give it up that easily.