No doubt they would make great stuff. And I would LOVE to see Paizo create 5e content...but i don't want Paizo to take the game and make Pathfinder 2.What's wrong with competition? It works out better for the overall community.
Pathfinder didn't obtain the top spot because they were backed by deep pockets. They took the spot by producing more creative and interesting content. WotC should not be afraid of competition. Though I am surprised that the business people want an OGL. I think Mearls and the creative people won't mind at all. Many of the creative people make companies and produce content for the game like Monte Cooke or Sean K. Reynolds. I'd love to see Paizo get a shot to produce material for 5E. Their modules are top notch. They would add great stuff to the game.