First I want to say, I like all your thinky thoughts.
Your questions about the tablets are interesting. Not that you asked, but I think the tablets were created like an encyclopedia. The Leviathan, Demon, and Angel ones we've seen are part of the creation series. I second rog457's idea that the tablets were made for humans (like the bible) to understand more of God's plan and work. As Lucifer and Uriel complained, humans were the most favored and the knowledge of the tablets would enable us to protect ourselves from both angels and demons should we need to. I'm not against the closing Heaven and Hell "forever" storyline because it wraps up the mythology that has been dragging around since stopping the Apocalypse.
Obviously this leaves Cas (and any other angel/demon who is on Earth when the gates close) in a precarious place. I didn't hate him stay behind with the old guy at the end of Hunteri Heroici, because as much as I love slowly-becoming-human-so-now-he's-a-hunter!Cas AUs I don't think it would work with how canon is shaping right now. Maybe Cas can continue his atoning until he forgives himself and then possibly go off hunting on his own, occasionally calling up Sam and Dean for help like Sheriff Mills and Bobby did. I just don't think Team Free Will hunting will work because Sam and Dean are in a point were their relationship needs to mend.
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Your questions about the tablets are interesting. Not that you asked, but I think the tablets were created like an encyclopedia. The Leviathan, Demon, and Angel ones we've seen are part of the creation series. I second
Obviously this leaves Cas (and any other angel/demon who is on Earth when the gates close) in a precarious place. I didn't hate him stay behind with the old guy at the end of Hunteri Heroici, because as much as I love slowly-becoming-human-so-now-he's-a-hunter!Cas AUs I don't think it would work with how canon is shaping right now. Maybe Cas can continue his atoning until he forgives himself and then possibly go off hunting on his own, occasionally calling up Sam and Dean for help like Sheriff Mills and Bobby did. I just don't think Team Free Will hunting will work because Sam and Dean are in a point were their relationship needs to mend.
Sorry I spewed so many words at you. :D