I think kickoffs will get phased out too. Player safety is always going to be the most important thing in high school sports - as it ought to be.
As for kicking extra points, I can't imagine a scenario where they move the ball back or anything right now. Some schools have teams who can't even line-up a field goal unit, let alone get a kid who can kick the ball accurately from 25-30 yards out. I just think it would help the better programs and hurt the worse ones disproportionately. But, I could also just be an old, crazy guy.