I don't think the people playing those other games would be interested, since it would mean vastly fewer adventures, settings, etc., being created, as well as a loss of the hacking culture in the broader games space. People who mostly play 5E may think there's a lot of homebrewing going on there, but it's a tiny fraction of what's happening outside that space.
"Quick, quick, come back to D&D for a product line that might, if you're lucky, get three or four releases over five years after you give up hundreds of things created for your existing game over that same time period" isn't an enticing deal for most folks.