If pro/rel becomes a thing, does that take away from the other state championships? Let's say 5A is the highest/best teams, is winning the 4A or lower championship like winning the PMSL or Open Cup? Does it mean less?
I just don't think you can have pro/reg with teams that's rosters completely turn over every 2 or 3 years, 4 if you are lucky.

The reason it works in professional football is because the core of those teams stay together from year to year and they can add players of their choosing to try to get better to be more competitive.

In high school sports, just because you are competitive and win one year, what if you had 13 seniors and are rebuilding the next? You have to play in a league full or "good" teams to just get beat up on?