They need orbs to hold the volley of GG and NB. You get orbs from getting kills with your supper. You can't kill what you can't touch. Titans can't be touched if they have layers upon layers of walls.
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Overload the few, send massive amounts of GG or NB at just a few bubble clusters and over load them. Rinse and repeat. Come a walking bomb as you get GG'ed. Nevermind the a hunter could just super, go invisible and walk inside your bubble. Can't hit what you can't see.
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And you think this a 2v1 fight? Hunters and Warlocks are going to be at each others throats as much as Titans.