I agree, I would love to have level 3 hypers for all, and at one point in time 2 years ago we were discussing it but we have bigger fish to fry at this time.
Even with the high quality of the characters in the game so far, there is so much yet to be done to harmonize everyone. And even with all that work there are still some many other single character items to be completed as well, Human Torch's flight, Rogues stealing ability, etc...