@all: I absolutely agree with you that making a thinner machine and sacrificing performance is not the way to go. What I liked about the 2011 iMac is that is was a competent desktop, matching the performance of similar-specced custom build PC towers of that time while having approximately the same price (if you take the display+wireless peripherals into account). The small form factor is just a bonus.
However, you have to decide whether this discussion is an academic one or not. What I don't get is why most people here are assuming that this is what actually will happen with the iMac. I mean, if Apple manages to make it thinner, but still pack the i7-3770 and a 680m or the 7970M - then what does it even matter how thin that thing is? Now, if the new iMacs do not correspond to the performance standards of the 2011 model (fastest available CPU/mGPU) - then, believe me, I will be among the first ones to criticise Apple.
However, you have to decide whether this discussion is an academic one or not. What I don't get is why most people here are assuming that this is what actually will happen with the iMac. I mean, if Apple manages to make it thinner, but still pack the i7-3770 and a 680m or the 7970M - then what does it even matter how thin that thing is? Now, if the new iMacs do not correspond to the performance standards of the 2011 model (fastest available CPU/mGPU) - then, believe me, I will be among the first ones to criticise Apple.