Honestly, this would never happen, but it would not bother me at all. Not one bit. I might even prefer it to things continuing as they are. I would rather read about a different character entirely than continue to see 616 Peter portrayed in this infinitely regressive state.
Going a step further, if a teenage Ultimate Peter taking over Amazing Spider-Man was what it took to open the door to allow 616 Peter to grow up and restore the marriage, I'd take that deal in a heartbeat.