Best solution ever:

Make all 'new' players watch every. single. cutscene. in. the. game (ok, they can skip the end credits ...), and then start at level 90 in the next expansion. 400+ hours (where do people get that idea from? That's nearly two straight months of 8 hour days spent playing the game. Even I don't remember it taking that long) condensed into, what, 50 hours of cutscenes? Win-win!