you won't make yourself a name if you follow the rules

Dear world: the problems with seasons six and seven of Supernatural were not caused by Sera Gamble's showrunning and will not be solved by Jeremy Carver's showrunning. Said problems were certainly not caused by the absence of, and will not be solved by the return of, a showrunner who was working on the show in its early years. Look at Gamble's SuperWiki page. She wrote or co-wrote at least three episodes a season every season. Usually four. Sometimes five. Starting with 1x03. Gamble is the definition of 'someone who was working on the show in its early years'; Carver, though also writing four episodes a season for every season he was involved with, was only on Supernatural S3-S5. That's middle years, not early years.

The problems of Supernatural seasons six and seven were, 'how does one top the apocalypse?' And that's...about it, really. Carver, had he taken over Supernatural for S6-S7 instead of going off to Being Human US, would have had the same problems. Kripke, had he stuck around, would have had the same problems. It is not Gamble's fault.