'Supernatural' scoop: 100th episode will be heavy on mythology

I think it should be Lassie. NO ONE can say no to Lassie.
“What’s that Lassie, there’s a bus load of boy scouts trapped in a hurricane dangling on the edge a rumbling volcano, and u want me to follow you up there? Okay.”

Here’s TVdb’s synopsis for the next episode:
It’s called oint of No Return
Dean (Jensen Ackles) begins to think the only way to stop Lucifer is to say yes to Michael, but the angels decide they don’t need him anymore.

Dean, Sam (Jared Padalecki) and Castiel (Misha Collins) are horrified at the angels’ new game plan and take on Zachariah (guest star Kurt Fuller) to prevent an all out war on Earth.

ok, so dean is obviously going to accept to be michael’s vessel, because one of them is going to have to do it and sam was already lucifer’s vessel. so dean will go to do it, and then the angels will be like “oh, we have some other plan, so we don’t need you now” and whatever their plan is, it will involve michael still accomplishing his task yet sam and dean remaining themselves… because it would be sad to see jensen ackles as anyone other than dean.