In it, Eyonix responds:
These are the same concerns (only x100) we saw before Burning Crusade launched. Once the expansion released though, these concerns were almost completely non-existent due to the excitement of getting an upgrade, regardless of item quality. Beyond this, here are some points to keep in mind:
Getting better gear now will give players an edge when leveling in Wrath of the Lich King, which in-turn will give them an edge in gearing up at end-game.
Having end-game epic quality gear (especially depending upon the item level), gives players an edge now.
Not all players are in epics.
Epics of high item level, i.e Black Temple epics vs. Heroic dungeon epics will last much longer.
It would be unhealthy for the game, and players if an MMO remained static and didn't evolve on all fronts.
As usual, Sir Eyonix makes a few strong points, especially related to gear longevity. I remember when I was leveling my Warlock from Level 60 to 70, much of my High Warlord raiment was intact when I hit the big 7-0, and performed beautifully even in Karazhan. It took a good while for me to replace my excellent Level 60 epics, because much of the gear I came across while leveling to 70 didn't even come close to what I already had. I'm sure the same will be said of very high-end Level 70 gear as people lucky enough to sport them work their way to Level 80 in the WotLK.
With that in mind, it's easy to understand why putting much effort into the game now and gaining access to the highest level epic gear isn't all for not just because an expansion rolls around. Much of the stuff may indeed be around at Level 80. Sure, it may only be for a short time, but the point is that it'll still be there, and will be very useful along the way.