After skimming through some of these posts, reading what Lore has posted and a lot of some of the other people that got quoted by Bashiok, 7 bosses in my opinion is also too few.
Ok, if there were say 2 or 3 new raids in 4.2, 7 per raid would be fine. But no, it is only Firelands. My guild runs 3 days a week, on 3 hours per night. Yeah, we haven't killed every hardmode yet, but on a good night for us, we can clear BWD, and BoT. That leaves 2 nights to do Throne of the Four Winds (which in my opinion is a joke).
I LOVED Ulduar, as I'm sure several other people did as well. What was it, 14 bosses? Also the fact that you didn't need to manually change the instance to Heroic to do the hard mode. I loved having the option to do the hardmode of the encounter when you were fighting the boss. Hodir: kill him within a certain time frame, Mimiron: Press the Red Button, etc. Those are more interesting to me than "Ok, switch it to heroic so we can do just this one boss, then we can switch it back."
In my opinion, if you were only having one raid for a patch, give us more. I understand that there is a lot of work that has gone into Firelands already. But 7 bosses just doesn't cut it in my opinion. Like others have said, even if the bosses are a bit more challenging, there will still be the point where we are just going to be tired of running the instance due to lack of content. ToC was a joke. My guild ended up going back to Ulduar to get new people their drakes just because there was nothing else to do. I do not want to do that with this raid.
I do support blizzard with everything they do. I just think there should be more than 7 bosses for one whole tier of raiding.