Plenty of people like the challenge, but not everyone has the ability or maybe even desire to be in a guild capable of tackling it right from the get-go.
It's always been our intent to offer new raid tiers in Cataclysm that are difficult to provide challenge to the raiding guilds, and then gradually allow older content to self-nerf as people gear up through VP, and then eventual literal nerfs to the content. That's something we've been communicating for some time.
Burning Crusade swung the pendulum one way, and Wrath of the Lich King swung it back too far the other. We're attempting to find that middle ground where there's still something brutally difficult for the cutting edge, but content gradually comes down until it's extremely accessible (ie PUGable) either simply through gear proliferation, or literal content difficulty nerfs.
There's always going to be two sides of the fence, some people want things more accessible for them and that's cool, we want it to be too, and some people think it should be difficult and always be that way because that's the way they had to do it. The fact of the matter is that as an MMO the end-game bar is constantly being raised, and progression content is in general not a place where we're going to purposefully gate prestige through difficulty. There are some exceptions of course, hard modes and unlockable bosses are purposefully there to be more difficult challenges, but as a whole our intent is to create a constantly moving ramp upward for Normal difficulty raids. That has to mean that the Normal raid content that was the hardest will one day be the easiest.
You will very likely see this same happen for Firelands when the raid tier above it is released.
I honestly have no problem if your developing team decides to nerf content to the ground, make it easy/medium/hard mode. Like in every expansion, with nerfs, buffs then again nerfs, I adapted, hence why I'm still playing my druid.
However, I will never get tired of repeating this: there has to be something else to do in the game that is not raiding. Yes, there is pvp too, and I used to pvp a lot, but since resilience it became unappealing to me. Most things you do in the game aims towards raiding. Now with the smart raid-ids, you get saved and have nothing else to do until the next week. Why hasn't Blizzard focused more on developing content that can enhance the social aspect of the game? So many posts related to the LFD tool from people verbally destroying each other. The casual/hardcore dilemma. I've posted suggestions before about ideas that could be implemented in the game that have nothing to do with character progression but more related to bring people together, to get them to know each other.
Back in Vanilla, when there was no LFD, a lot of people from different guilds knew each other because at some point they ran instances together, then talked about the experience, word-of-mouth and we could have long chats in /say that would drag more people into them. Today, you see 2 people talking in /say and more than one will tell them to shut up. Even though LFD is an option, people choose it out of convenience. People walked to their jobs long time ago. Then they used horses, then mass transportation. Would people go back to walking to their jobs nowadays? Probably not, because it's convenient to drive or use a motorized mean of transportation to get there faster.
I'm not going to hijack this thread and repost my suggestions here. If you want to read them, do a search and cast your opinion there.