After thinking it over a bit, yeah I don't think this game is dead. NASB never had as high a peak, and fell even harder, and yet it got a year of dlc and is getting a sequel. I don't think this game is getting shelved after one (admittedly bad) season, at the very least they'll give it one more as an ultimatum. Two of the characters that are coming soon , Joker and Samurai Jack, are also big draws that would hopefully bring eyes back to the game.
it's easy to worry, and I won't lie and say this game is in a stellar situation, but it'll at least get a little better.