So you have community A, the people that, for sake of simplicity, don't really want to have to try and/or don't have the time to raid. Thus, LFR.
Then you have community B, the raiders. These folks deal with Normal, but more often than not Heroic is the goal.
Normal difficulty appears to be the middle ground already. So why was this simply not added to Normal difficulty to allow less serious guilds the flexibility to do this content? Maybe even have it pugable in a casual setting? There basically seems to be no purpose to add another tier of raiding.
Additionally, this new "feature" is going to further hurt the already dwindling raid community. There is no doubt in my mind that Blizzard is looking to gradually phase traditional raiding out of the game, or at the very least make it a side note at best.
The apparent direction that this new "feature" is taking World of Warcraft is disturbing and disheartening. This will do nothing to contribute to the reestablishment of server communities, it will not generate new and exciting experiences, and it will only push players further away from "real" raiding.
So again, what exactly is the point of this besides trivializing what is already in the game?