Earlier I asked who would want to run McDonalds. The general idea was to look at why there are almost no entry-level raiding guilds, the reason being that the raid leader gets the same tier of rewards as those he leads, so there's no incentive for a skilled raid leader to stay there rather than going up to a raid tier with better rewards. I was only looking at the raid leader, but what about his employees?
Who would want to work at McDonalds?
Imagine if we had completely free education up to the college level. Not just professors, but books, materials, beer, etc. And in this virtual world housing is either everywhere or nowhere. Who would work the jobs for high school dropouts? With our trivial heroics we can overgear ToC and get a solid set for ICC. We're all college graduates. Naxx and Ulduar, those are for uneducated idiots.
Could there be any incentive to run anything but the latest couple tiers? Obviously there would be if we didn't have so much badge loot and so many easy badges, if we couldn't skip raid tiers, but that means every alt is going through the same raid over again, and every new player has even further to climb up. 5k gearscore is annoying enough with badges, imagine that by first working up to a gear level for naxx, then ulduar, then toc, then finally ICC. Sure, technically speaking, you can do ulduar in blues and maybe toc, with ICC only needing a decent set of epics, but that's unrealistic for the majority of the population, especially with new players.
Would you want to work at McDonalds?