You cannot compare Eve to other MMOs, you just can't. I wouldn't bet on those 2.5 years. All it could take for another boom is a good expansion from CCP. The game is still alive and kicking even with all those poor decisions from CCP in the past few years. Imagine what would happen if they actually started making successful expansions. Plus the game looks gorgeous, the art team has really kept up with modern graphics. We could also see a swift towards MMOs again which Eve would greatly benefit from. At worse case Eve online goes fully f2p and it gets another 5 years easily.
You would be surprised how many people are seriously attached to the game and the friendships they made over the years and CCP removing a really broken feature they loved wont change that

. Eve online in maintenance mode with around 10k people could easily last another decade.