I think instead of the Brons turning on Seth, he should have relinquished the title directly to them. He beat Cody Rhodes but the real test was the injury; is he truly a visionary and revolutionary? Yes, the vision led him to the Brons and granting them the title as the future of the industry was revolutionary. He wasn't giving them anything, they "earned" the title by sharing his vision. The future is now.
Anyone wanting that title would need to pin both Bron Breakkker AND Bronson Reed. How the hell did Seth get HHH/Adam Pierce to agree to this arrangement? Who knows, you could write that later if people complained about it, I don't know.
The split could come when Seth returns. You'd think it would be because he wants the title back (yes, they would still have it) but it's actually because they've outgrown him and his "vision." By this point there would be cracks in the Bron/Bron alliance anyway so eventually it would all fall apart by like SummerSlam 2026. Bron Breakkker would be the face and Reed would be the fat monster heel WWE has been sorely missing.
Not my best fantasy booking but it's totally different than the norm and it would set Rollins up for a nice face run down the line as well as Breakkker. Also you could get a heel authority angle spun off if you so choose after one of them was found to be colluding with Rollins/Heyman behind the scenes for some reason.