I don't think so. Ethereum is not only run by Vitalik Buterin, but it's also a team and it is decentralized and open-source. So for me, even Vitalik Buterin will not be here anymore, Ethereum still exist, just like Bitcoin now, Satoshi Nakamoto is gone but Bitcoin is still here, running and kicking.
What I am expecting only to happen is on price of Ethereum, it will react, like dump and it will just go up. Just like before when someone spreaded fake news that Vitalik Buterin found dead.
Satoshi Nakamoto never revealed himself to the public, so his absence didn't have a negative effect over BTC's price. With Ethereum, it's different. So many people have associated ETH with Vitalik Buterin these days. If he's dead, you can bet market prices will dump real hard due to panic selling. I know the project has other people behind it, but things won't be the same as they were with Vitalik on-board. Just like Apple which lost its luster after Steve Jobs died. Apple's CEO Tim Cook is not as innovative as Steve Jobs was. Things will be even worse for ETH if it doesn't address centralization issues beforehand.
I sure hope decentralization prevails, so Ethereum could carry on with its mission of "decentralizing the web". No one can predict the futue, so lets hope for the best. Just my opinion
