User blog comment:Noctosphere/What if Sera Gamble stayed?/@comment-1975828-20160531114916

I don't know.

A good handful of lovable characters died during Sera Gamble's era. However, we did get a brief return of some old characters who haven't appeared since.

Example of deaths : Rufus Turner & Bobby Singer

Example of returns : Jo Harvelle & Ellen Harvelle & Azazel

Admittedly, some of the best characters I know came from her era : Balthazar & Garth & Charlie

Considering how people often complain that Carver's era was stuffed full of inconsistencies, even more character deaths and boring plots (except for s11), I guess we might have enjoyed Sera a little longer.