Your post seems to have an undertone of nervousness about the exchange rate of USD/cryptocurrency which is understandable in the middle of this bull market. In my opinion bitcoin is a revolution disguised as a get-rich-quick scheme. A whale liquidating lots of BTC sounds like a sweet bargain to me. BTC has a capped supply so they will run out of steam at some point.
Due to game theory mechanics most network participants have an incentive to play by the rules and agree on rules that are as fair as possible. A hard fork has to be embraced by the majority of the users to be accepted. It's not just the miners or the whales who decide the rules.
Of course there are countless of cryptocurrencies in use right now of which most are doomed to fail (maybe even all but one are doomed to fail).
Due to game theory mechanics most network participants have an incentive to play by the rules and agree on rules that are as fair as possible. A hard fork has to be embraced by the majority of the users to be accepted. It's not just the miners or the whales who decide the rules.
Of course there are countless of cryptocurrencies in use right now of which most are doomed to fail (maybe even all but one are doomed to fail).