A Theory: Expansion for WOW

[Lissa]

Ideally, a higher level cap would mean a big slew of high-end content that can compete with the new levels.  Would Scholo/Strath and everything else go down in difficulty?  Yeah, but your characters should feel some advancement eventually.

I still think the major problem they have with raising a level cap is talent trees and what to do with them.  The rest can be accounted for with new content, even if it means reducing the current 60 content to a lower status.
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And there's another possibilty for the expansion, the release of hero classes. May not need to rebalance talents if the levels tacked on are for the hero classes.