That would make gameplay very slow, and it would require a complete overhaul of the Ki-system. The Ki-cost of every attack, every move, would have to be adjusted, because you couldn't just regenerate Ki anymore. You wouldn't be able to use all the moves as much anymore, because it'd be much more difficult to gather up enough Ki. You couldn't swoop as much, fire attacks as much, etc.
So yeah, I don't think the idea would really help the game much.