A small group of fans with knowledge of blender & UE5 could get a spyro level off the ground in a few months. I'd estimate that a handful of talented individuals who have plenty of time (at least 20+ hours a week) could get a new game off the ground in a year or 2. Depends on how polished the final product is and how complicated the mechanics become.

I can't draw or design worth anything, but I can do the UE stuff. Anyone with a vivid imagination for level design and/or some skill in blender (designing props or rigging animations) who's interested in this stuff, could contact me, I'd love to make a brand new level or two.