Dunno people act like QUESTING is the reason they play but they wouldn't touch a quest if it turned gray...
I got Loremaster before Cataclysm launched. On my lvl 80 warrior. Then i did the quests again on the same character to get the new zone achievements. Did i gain anything but a few hundreds of gold? Nop. I just wanted to see the changes and the quests.
Again, there's so many quests in the original world that they could've made it scale from 1 to 100 and i think you'd have enough to get to that level. If they expect to finish all the quests BEFORE hitting 60 i fear for the future of the game...cause seems like Blizzard likes to listen to people like them...