That's without a doubt, mate. Compared with most altcoins on the market, Ethereum has the most trust in a similar way to Bitcoin. Many people have used this cryptocurrency at a large scale, which means that there shouldn't be any reason to worry about Vitalik's death in the future. If he dies, then he'll be remembered as one of the most prominent figures in crypto land. Another person might succeed him after his death, but if it doesn't happen, Ethereum will continue with the vast amount of developers working on it.

The pioneer smart contract platform not only has support from a wide number of developers across the world, but also from individuals, businesses, and companies alike. With many things that have happened (such as the Enterprise Ethereum Alliance) and those that will happen in the future (Raiden Network, Plasma Framework, Casper PoS, Sharding), Ethereum will be here to stay for a long time.

Therefore, investors shouldn't pay much attention to Vitalik's death, if Ethereum remains a solid platform for dApps and tokens. Just my thoughts