You can infinitely get orbs but (correct me if I'm wrong) you can't put down more than one orb at a time per titan. So you're stuck with only a few bubbles that if other supers do take down them the titans would be screwed. And even if they can't be broken down go and try to step out of your bubble shield, you'll be GG'ed almost instantly. Not to mention the AoE explosion from it would end up taking out all the other titans. The titans wouldn't get and kills since their sitting in their disco bubble while the hunters kill off the warlocks and just sit back till the game ends. You can win a game with defense if no one attacks you.