I dunno, seemed like the characters themselves had the basic jist of what was going on by the end.
But I do agree that something much more meaningful could've been done with the Desmondverse. I really liked the stories they did with it over the course of the season.
E: ^^^ The Sawyer/Miles buddy cop thing could be pretty amusing. They'd be constantly trying to catch Desmond, who would don various disguises in order to get close to Ben and punch his lights out. And run over Locke.

