From a lore point of view, everyone loves the endgame. Illidan, Kael'thas, Yoggy, Arthas/the Lich King; it's great but not everyone actually wants or has the time to spend hours in raids. A friend of mine once told me that 'WoW starts at 60' although that probably should be switched out with the current level cap. I'm sure for some players this is not the case though, far from it. As Blizzard makes the game more friendly to twinks and leveling toons by letting you disable XP gain and supplying mounts ten levels earlier, it makes me wonder if people are going to shun the endgame in favor of enjoying everything else Azeroth has to offer.
Let's imagine for a moment that you can't/won't raid any of the Wrath content. What would you do instead? I'm talking the little things in life like rolling a new toon and exploring all those newer locales that you missed since leaving to Northrend. Are you going to turn off XP and just see how it feels? Rather than do the endgame, are you going to give PvP or PvE a go? Go for that really tough achievement? What about a little role playing? Would you finally level up that second profession or give first aid, cooking and fishing a go?