Only thing is, there's nobody to step into his place as like, the epic, awesome antagonist. Rowena certainly doesn't have the appeal that he has, and definitely not Metatron. So maybe they'll let him live a while longer.

That's a good point! Much as I loved the last episode, I almost wish they'd kept Cain around a bit longer for this reason -- I think he'd make a more credible Big Bad than either of them.

But narratively speaking, it only makes sense that Dean will "kill" both Cas and Crowley in some form before the end of the season. :-S

Yeah. :(

*whimper*