What you may or may not find interesting is the last time I played WoW (before the TBC expansion), before this time, when I hit the L60 cap I more or less abandoned my character and started new ones. I saw no point in repeating the same dungeons over and over again just for gear. Now I'm in Northrend and and am exactly doing that.
The Difference?
Before TBC, all the end game action was 40 player raids more or less. Now I can zip through 5 player heroics in 60 min or less and have a great time, without the huge time commitment involved in taking down the huge dungeons.
Blizzard came through for me. However, if I had a choice, although I realize it would be very tough to create with huge populations of subscribers, my fantasy is I a dynamic changing world would be cool, where you can quest & explore to your hearts content, where you don't have to continually repeat the same dungeons for entertainment, where things change and stay changed and I'm not referring to Cataclysm, because although the WoW landscape will significantly change, my impression is most of the details will remain the same- respawning critters patrolling the woods on hidden tracks- a static world, although phasing does alleviate some of the static-ness in some specific cases.