eth has been survival for 7 years so I believe it will keep survival more than 5 years at least
ETH will last forever if Bitcoin is still operating and living in cryptocurrency, because talking about an age of cryptocurrency or Altcoin in essence, Dogecoin has also lasted longer in cryptocurrency, even though Dogecoin is just a meme.
Ethereum will always move forward and will never die in the future. you can see a huge fan on ethereum and it will die for nothing? it's really funny when that happens. There will be new coins that appear and continue to move up.