The irony is that people who have been waiting on the 2012 iMac since february on the grounds that they won't pay for 1 year old sandy bridge tech, will now be in the position to buy 1 year old ivy bridge tech.
Very few people care about the SB -> IB upgrade. Mostly people are concerned about USB3, SSD and the GFX for me. Those are outdated and whenever they are launched will be more appropriate than they are now. The SSDs will be priced the same as laptops, the GFX will be nVidia and the USB3 will be... USB3.
Also I'm sure some people are eager to lose the super reflective screen the iMacs have right now.
But ye, I think few of those who waited since february actually still believe it was the best choice. But decisions cant be based on hindsight (thats how poker players lose). You have to take the best information you have, and decide from there. Statistically you will end up for the better. But ye, sometimes, life kicks your teeth in and says: "No, bitch, you're not making lemonade"