You said it differently than I would have Gerbera, but I think this is the single biggest reason for the burnout that has affected my guild and most of the raiding guilds on my server (at least it seems that way, based on forum chatter). We've lost half of our ten-man team over the past three weeks - all of them quitting the game outright, not just taking a break, and to a person, the reason is boredom - there is nothing to do other than log in three nights a week for progression content. There are only so many alts you can level, and so many times you can do the same five zones with the same five levels and the same five faction reps.

While I love the 1-60 content, I really feel Blizzard fell down on 80+, where their principal strategy was to make earning raid-ready gear a longer (although not necessarily harder) slog in place of creating more content. I think a lot of raiders were used to the process in Wrath, where initially the ramp to Naxx took longer to get to, then patch content provided enough value-added rep grinds and other stuff (including easy raid-ready of alts) to keep you busy.

I don't really see anything in 4.1 fixing this, so I guess it's not something Blizzard is that concerned about.