Time for some non-spoilery speculation about the end of Supernatural S3

S1 was all about John, S2 was all about Sammy, S3 was all about Dean. Can we have S4 being all about Mary? Something about Mary?

1. S1 type ending: Dean dragged off the hell watching Sam facing the forces of evil and immanent apocalypse on his semi-Darkside lonesome.
2. S2 type ending: Sam and Dean resolve Dean's deal and the incoming war; plot of S4 revolves around something new.
   

I *so* want a Bela Talbot spin off show with elements of Supernatural, Mission Impossible, Raiders of the Last Arc, James Bond and MacGuyver. She could be all smooth and sophisticated on the surface and own bizarre supernatural and natural  tech and have an assortment of really varied, weird contacts. She'd do lots of dubiously moral things and be incredibly complicated internally and occasionally confuse us by doing things that appear to be fundamentally good and there would be snark and sneaking around and dressing up and instead of MotW it would be Heist of the Week.