i reckon they believe we'd hit 80 the day Woltk comes out and the tought of players spending a few days or weeks grinding dungeons on normal for the rep to unlock heroic might make the players with a gazzilion epics at 70 bored and turn to warhammer online.
as much as id love to go straight to heroics i do remember grinding normal dungeons till revered to be such a joyfull experience and yes i totally agree with Spend: id say 90% of those normal grinding was with PuGs.
but i am glad im in a guild with players who doesnt mind gettin kidnapped !