Mistwell
Crusty Old Meatwad
I doubt that
5e is good but it isn't neither close enough to perfect nor modular enough to go on forever.
It's almost 5 years and it's not at the state it would need to be to stay evergreen.
Almost 5 years? D&D 5e came out in July 2014. It's selling more now than the day it was released and has increased in popularity every one of those 6 years. I can see arguing you don't think it's good enough, but I can't see arguing there is some modularity or readiness state that it's failing to achieve such that it would be a barrier to remaining evergreen. In fact I think the modular issue went out the window in year 1 for an overwhelming majority of D&D players.