CapnZapp
Legend
I'm not sure how much mass market appeal there would be. The reason for the popularity of 5e lies solely in it's simplicity. There is Pathfinder for a crunchier, more complex system, but 5e is far more popular.
That's selling 5E short.
5E is also popular because of it solving LFQW (caster martial balance).
And part of the simplicity is behind the DM screen, where you no longer need to create and equip monsters and NPCs.
Pathfinder offers no alternative to those of us that play 5E for those reasons.