


Just something about the dramatic element of seeing the whole turnabout is fair play for Sam to experience what being a vamp really does to you. Because something tells me he and Dean didn't talk about Dean's experience all that much. And you know they've still have got that extra pair of vamp teeth lying around the makeup trailer somewhere.
And maybe Dean could learn the lesson that this is what happens when you trust a monster, the absolute worst thing possible, Sure he's seen ultimate betrayal happen with Sam and Ruby. Sure he experienced that himself with Cas, ultimate betrayal by a non-human you've trusted, but both he and Sam seem to have forgiven and forgotten all that. So Dean doesn't know this by personal experience, the whole thing about going out on a limb, trusting a monster which you've been spending your whole life hunting and killing just to have said monster turn around and well, surprise surprise be a monster...
Dean would have to hunt Benny down to get the blood to turn Sam back, he'd have to restrain Sam until the potion was ready somehow (oh the possibilities yum). Maybe he'd even have to kill Benny himself to save Sam somehow. But that way he wouldn't be mad at Sam for having to kill his friend, he'd feel guilty instead. Dean's much more comfortable with feeling guilty (add it to the endless list) than being mad at Sam.
And if it ends up being Sam that has to kill Benny, then how is Dean going to react? What are the chances of him being as understanding as Sam was when he killed Amy? Slim to none I'd say. So that would extend the brother angst and separation even longer, which I really really don't want to see.

Or maybe they are planning to keep Benny around for the long haul as a character vying for third-wheel status with Cas? Sam and Dean have to decide if having an angel or a vamp around as a hunting partner is the better choice. But honestly having a cage match with Benny and Cas might be good tv depending on how they do it.
I guess I'm just looking for more scary from Supernatural right now, and vampires as they do them, are in that category for me. Plus, all this unresolved mystery about Benny needs to get wrapped up. Like whether he was the real killer in the last episode (before Martin), and whether Dean still feels he can trust him after seeing what Benny did to Martin, and whether Sam vs. Benny is still on, and oh yeah what would Cas have to say about Benny hmmmm?
What do you think yes more vamp action or no I'm sick unto death of those bloodsuckers.