Relax, nobody was complaining about thickness when 2011 iMacs were around. Hey, I'm not happy about the prices either but you have to admit that there is nothing on the market like this right now.
And please, tell me how they'd stuff those internal components into 1" board. ?
Exactly, the 2011 model wasn't too thick. So why is Apple charging $100 more for a thinner model, and one that actually isn't that much thinner other than the edges?
As for "stuffing" the components into 1", they don't seem to have a problem putting similar components into the retina MacBook Pros, which are less than 1" thick.
Looking at Apple's picture of the new iMac internals, I bet it's all less than 1" thick already except for the heatsink and the hard drive. Heatsink is no problem, there is clearly more than enough space to make it flatter and bigger, and make the fan bigger (or add a second fan). The hard drive is no problem, just switch it to a 2.5" model, which runs cooler and quieter anyway, and could run at 7200 RPM and be passively cooled in the 21.5" model too. Yes, you give up the possibility of a 3GB internal hard drive, but that's what all those great USB3 and Thunderbird ports are for.
So why didn't they just make it thinner, you might ask. Well, probably the main reason is that they wanted to stick with a 3.5" drive because they can be bigger (3GB) and also because they are a few dollars cheaper for the same size. Two, maybe they didn't want to have a (2x?) bigger exhaust vent for wider/flatter cooling hardware. Three, maybe the design of their stand/hinge puts a restriction on the thickness of the device and they didn't want to redesign it.
Anyway, it looks like I'll be picking up an almost-new 2011 27" iMac from Craigslist for $1150 in the next couple hours. I'm happy to save $650 vs. getting a fake-thin computer with a minor CPU/GPU spec bump, no optical drive and an SD card slot in the back.