And if we added a 7A, for the top 96 teams, you'd just be making travel worse up and down the state for all those medium sized towns. The D1/D2 split already makes some schools have five hour one-way bus rides to get to their conference football games.
Texas' population is growing. Short of going the Florida route and having 8 classifications, we're about as good as we're going to get.
But remember - football drives the bus, but it's not the only passenger. You want a division that only has a population range of 400 kids in it? Be prepared for (randomly selected East Texas towns) College Station to have to drive to Brenham for a game - and to Livingston - and to Nacogdoches.
And woe betide anyone in West Texas - we'll get Class 4A district games between El Paso and Weatherford. Meaning those volleyball girls will have that drive to make on a Tuesday, missing basically all day of school, and then have to come back home, get home at 4 AM, and then come to school the next day.
Sorry, no. Just no. "It's not fair" isn't a valid argument here. It *IS* fair. It's just not set up for every program to have an equal chance to win.
(And don't get me started on how Dallas, Houston, Fort Worth, San Antonio/Northside, and El Paso ISDs take the short end of the stick EVERY SINGLE TIME in realignment, because that's a whole other can of worms. Those schools seemingly NEVER play anyone outside their school district until they see the playoffs, unless they have non-conference games against teams willing to travel to "the inner city" to play them. Which many suburbs aren't willing to do.)