I'd be happy with this. Mr. frickin "I can AoE or single-target" Gault, I'm looking at you.
It would be nice if, among all your companions, each could DPS (well, except for your ship-bot, 2V-R8 or whatever Republic gets), and you'd have at least 2 healers and 2 tanks among the remaining 5 roles for each, so if you happen to have a companion you don't like (OP with Mako, for instance), you wouldn't need to look far (well, far into the storyline, possibly) to get a new healer.