There really wasn't anything in the Tempest Keep attunement line that arbitrarily excluded casual raiders. Anyone who seriously wanted to attempt TK should at least have the resources to run Magtheridon. The issue was difficulty, which is exactly how it should be. I think they made the right choice by removing an attunement quest that essentially blocked off half of TBC's raid content, but there was nothing inherently wrong with the questline itself, it was fun and difficult. Sure it couldn't be pugged, but even people who only play 5-10 hours a week can find a group of coordinated players that can run heroics. I sincerely hope that they make the death knight quest something along those lines.
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According to Warcraft Realms, the most powerful Arena class (Warlocks) are only the fourth most popular choice. The worst Arena class (Hunters) are actually third in population, I fail to see why making Death Knights inherently weak at small-scale PvP would be a good choice in limiting their numbers. Of course, there could be another reason altogether, like "We don't want to see Hero classes in Arenas." which you just can't argue against.
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I think that this is in large part due to the fact that the populations of different classes were more or less set before the release of arenas. People do roll new characters expressly to play them in arenas, but it's not enough to skew the overall population of the class by much (either in arenas or in general, I'm not sure which statistic you used).