That's literally the tyranny of the majority. Who determines what the majority is? 90% in your example, but what if 65% of people do the same and wipe 35% out?

That's literally the tyranny of the majority. Who determines what the majority is? 90% in your example, but what if 65% of people do the same and wipe 35% out? That could easily be done by buying enough of the coins / merging with enough of the users. That scenario is completely ridiculous and unacceptable.