They will shoot fireworks with random element and teleport like crazy. I hope we get gummy bears armed by fireworks soon. I swear right now combat is mostly about teleportation Right, and sudden spectacular chain reactions.
Why not make Teleport cost 2, or 3 (just a thought, this would need to be tested for balance) points in Aerotheurge? I think Larian has said they want to allow people to branch out their builds more easily in this game, but honestly, without the 'taxes' on skills, I'm just dumping all my combat points into a single category of attack, like Ranged, or into Pain Reflection, and it's a massacre every fight.
Oh, and as for everyone just taking the skill, this is a little off-topic, but the issue was raised, make skills cost more than 1 point investment in the related category. Why should Phoenix Dive and Tactical Retreat be better than Teleport in this respect? Traditionally, fantasy setting speaking, Teleport should be an escape and utility skill more than an attack skill anyway. The side quest that this would disrupt the verisimilitude for be damned. I agree that Teleport should either be limited by Intelligence and/or Aerotheurge levels, as suggested above, and/or require magic armor 'saving throw', but to balance this and reduce party clicks outside of combat, I think that the mage should also be able to teleport themselves.