Meta: Dean Winchester's Special Destiny

I've been thinking a lot in regards to Supernatural, reading some people's speculations for next season and what it might entail for the boys, Castiel, the apocalyptic mytharc and where it'll all lead to in the end, etc. I have my own theories which will be written up for a later date, but there's something I need to speculate with the current run about of Dean's "special destiny" as revealed in the S4 finale.

( The Righteous Man who begins it, is the only one who can finish it... )

Thoughts? Opinions? Am I being too far-fetched with my crazyass cracked out theories? I would love more input if you've got it, anything really. Keep in mind this is a mini-meta for what I have planned to go on for later, and more will indeed come. This is going to be one hell of a summer for meta-inducing stuff for my fandoms, believe me.