Exactly. Think of Naxx versus Ulduar. Sure, people ran Naxx for T7, but there was something better to get in Ulduar: T8.
do you think firelands raid will be the end game raid? i dont think it will.
End game raid =/= final raid of an xpack. It simply means that it's the raid that is the highest content you can do at the present time. End-game content consists of anything for max level characters. Daily questing, etc is all part of end-game content.
This isn't nerfing content to make every raid in the game "more accessible". Firelands will be the business end of raiding and will be the pinnacle of raiding. The other raids won't matter much anymore after Firelands.