Here is my view, 1-90 isn't broken, it never has been. It's just a chore. Even with heirlooms, random dungeons, it's still a bit too much of a chore with a 100 cap. So here was my idea. Sell an entire heirloom set, all pieces, all classes, with an extra +15% XP necklace .. sell all of that for $15. Call it the "All In One Alt Kit" or whatever. You buy it once.. you can use it on as many alts as you like. And bingo.. 1-90 is so incredibly easy.. you just queue for randoms and you're a 90 in no time. At least with this solution the 1-90 dungeons aren't ghost towns and healers and tanks will actually know how to perform their rolls before they turn up in 90-100 dungeons.