Whether you leave or not, won't change a thing. I refuse to accept that this game has nothing left. I still see lobbies where the game is played properly, though they are few, and even if people think this game is dying, I've seen plenty of new and promising players. 9 months from now( If the servers still function.) I'll still be playing this game online, even if it's just down to only clan battles.
Then I wish you luck in trying to keep Space Marine afloat.