When somebody is hated because has a lot of success has a name: tall poppies sindrome. But you don't worry when you soon recognize toxic people.
Today the market isn't ready for a third d20. Pathfinder appeared when D&D 4th Ed arrived but many would rather 3.5. And now the space should be the transition between medieval fantasy and modern age, knights vs pirates, armors vs gunpowder. To be a success should be an universal d20 where to can play different genres: gothic horror, space opera, superheroes, spies, WW II, far west, mechas vs kaijus. And d20 isn't ready for the right balance of power when enemies has got better weapons (only a shot with a bazooka to kill an ogre riding a dinosaur).
A third d20 game to be used by third party publishers would need to be a true universale genre. Maybe adding more abilities scores (astuteness, courage, technique, grace( = luck, karma, fate, divine blessing or curse).