It's never competition.I wonder how long that would take. Especially now that we have 5e-adjacent RPGs like Level Up: Advanced 5th Edition and Tales of the Valiant around. Nothing hastens a new edition like a rival RPG or two.Especially two built using the 5e chassis.
It's the designers running out of ideas that the community are excited enough to buy.
It's why D&D NEVER sticks to 4 classes. You run out of ideas fast.