Glitch is not the only game to ever run into these sorts of problems. Some other games continued to exist because the devs open-sourced the game and let users host the servers.
I don't want to hear about how complicated the game is or how it would take months to train new devs. This is the internet. Sure, it might take a few months... or a few years... but the internet has some truly amazing people. Someone could get SOMETHING running, even if it's on a much smaller scale than Glitch is now. I like to think that the internet would be a better place for it.
The worst that could happen is... nothing. The game would be down for good... And isn't that the situation we're in right now? What do you have to lose, Tiny Speck? Please, give the fans a shot.