1) Ethereum survives. By "survives" I mean survives for at least several months - a year and keeps it's current marketcap measured in BTC or gains even more marketcap. So the precedent is indeed set. It takes some time, but it will be realized, that all guarantees, such as: freedom from censorship, finite supply of tokens, prespecified emission rate, that people love so much about public blockchains can be modified, altered, canceled. Without those guarantees cryptocurrencies are useless. All cryptos die, including Ethereum and Bitcoin. Game over.
2) Ethereum dies. By "dies" I mean looses most of it's marketcap measured in BTC. Cryptocommunity learns another lesson: while it's possible to violate economically meaningful blockchain rules with a hardfork, it causes it's death. Cryptocurrencies continue to evolve. The game continues.