That would make things much more complicated.
Having 2 perk types (combat and non combat) would require the devs to create a much larger number of perks and they need to balance both kind of perks. I do not think this will happen.
The good thing about the perks in fallout is that all of them have only positive effects. This is something you chose in the game to make your char better. It is not like the background in arcanum (positive and negative effects). The main disadvantage of a perk is that you cannot chose another one instead. Of course, things look very different when you look at game changers like lone wolf or glass cannon.
They wouldn't need to create more perks. Just divide the current talents to combat and non-combat. They might feel a little on the few side, but it's better this way. Or just alternate between the combat and non-combat points granted by level-up. I.e on level 3 you get 1 combat point and on level 6 you gain 1 non-combat point. They don't balance anything at the moment because it's impossible. They would at least have a concept and logic to balance from. Social skills aren't balanced in the same way combat is, not really. Besides, nobody said game development is easy or fast. No art is.
