I've thought about this. I mean, he's almost duty bound to do so . . .
I think a cool series of stories (although mostly cool to hardcore fans who ALSO enjoyed the movie) would be a special ops team sent out to head off and stop/repair major threats that Old Spock knows about.
As a movie plot, it wouldn't hold up very well . . . but as an animated series or a series of novels, it might be kind of cool.
They'd stop things like the Doomsday machine, they'd have knowledge of DS9's wormhole and the Dominion, V'ger . . . all those things that have been mentioned before, but also smaller things like finding the Botany Bay right away, rescuing marooned people like Zephran Cochran . . . and then there's wars with other cultures that could be addressed, with treaties put in place before the wars begin. I mean, there's a pretty good bargaining chip here: "Hello, Romulans, we have knowledge that a star is going to have a crazy big nova and destroy your whole entire planet in a century and a half or so . . . wany some help getting starte on taking care of that right now?" (Actually, that'd be a pretty good re-unification tactic for Spock.)
The trick would be for the stories to be VERY character driven. You'd need a cool new crew, so you could enjoy how this new crew handles dealing with these new threats differently. And there's some cool philosophical ideas that could be tackled.
Hmmm, I may contact one of my publishers . . . this type of story need not be Trek . . .
This would be the way I'd like to see elements from the Prime Timeline addressed. I would NOT like to see Khan show up in a movie . . .
~ Ben