I think implementing either RUFFLE or LIGHTSPARK into e621 would be a positive outlet for creators on e621 to come back. And for new E621 artists to get a fresh start in flash and animating / Game modding. Once LIGHTSPARK is implemented fully into e621, artists can focus on what makes positive outlets without worry.
For me personally? Flash has always been about good quality games and playing them. LIGHTSPARK is in beta, but it could be used to make some exclusive furry flash game content on e621 like some Friday Night Funkin' Mods or something, and the good thing is with Flashpoint people can still create flash games, and once LIGHTSPARK / RUFFLE finishes development they'll have full dedicated support on the site.