Actually perhaps. If the current team continues to own and run it, it'll be around forever. But eventually they'll want to sell it, the team will change, and it

Actually perhaps. If the current team continues to own and run it, it'll be around forever. But eventually they'll want to sell it, the team will change, and its goals will become more feature-oriented for the sake of grabbing more premium members. This will give it less value (due to the removal of simplicity) to the average user, so its userbase will gradually shrink until a few years later they pull the plug. It's happened to almost every web service more than a decade old.