In case you don't recall that particular change, some items were "changed" quality-wise. Some players are worried that if the same thing's going to happen when WotLK, they're going to lose their epics and therefore, the effort they put in to get the epics will be wasted. Blizzard poster Bornakk explained why it has to happen:

One of the goals in expansions is to level the playing field a bit for players and we like providing extra opportunities for players who (just as an example) want to get to high-end content but are currently far behind on things.

Keep in mind that the availability of higher level items is greater than it was before the launch of The Burning Crusade.

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