They've been down the road. 90% of the schools want to compete with schools of thei respective size. They literally polled the coaches and AD's last year.They have no issue with 6 champions. You can still have your 6 champions AND have a better regular season.
10-15 minutes extra travel time isn't really that big of an issue for competitive balance.
The schools in a bind are schools like Woody High. They're a 3A school and if they decide to play 3A, they're going to more then likely lose Penn Hills, Gateway, PCC, etc from their schedule. They already have dwindling attendance. Do Woody High fans want to be playing Brentwood, Elizabeth Forward, Keystone Oaks, etc???