My help? I buy there stuff because it’s great fun. It because of allegiance.
I actually disagree. I think once you start to differentiate you either narrow that divide or continue off in your direction. 15 years ago Paizo got away with it because they were semi official and the natural successor because of the magazines and the fact APs were so original.
There’s no natural alternative now, there’s a dozen competing systems. My prediction is that the 5e-a-likes either dwindle into very niche products with very small but loyal followings, or their makers go back to making adjacent products to whatever the current edition is.
The more time that passes the greater the differences will grow.