Is there a mod, or the possibility of a mod that lets you restart the game as the same character (same level, same items, etc) but make the game more difficult as per your presumed character level, akin to a Nightmare and Hell version (re: Diablo 2)?
I like the overall game, but I'd love to see if it could become even more epic, especially since the end of the game results in you being around 40th-50th level, and you can easily go beyond 100th level.
Personally, to have a literal army fighting another army (with platoons ranging in the 10,000+ sizes, who wouldn't love to try and fight 500 red dragons all at once

) just sounds fricking fun as hell.