Personally, I don't think Ethereum is going to be forgotten and both users and projects abandon it overnight. If it is true that it is losing a lot of popularity in favor of BSC and Tron, but Ethereum will not disappear, when the current problems are solved and ETH 2.0 is finally released I am sure that Ethereum will be born again. But the truth is that now it is giving us a lot of problems, and if people find alternatives, which exist, they may not use Ethereum again, who knows.