The market - supplies and enthusiasts - are hot on the trail of Xeon and dual Xeon systems as a result of millions of CPU's being retired and resold on Ebay and other marketplaces. As you mention, Xeon's aren't the only desirable CPU's, top of the line I-7's are doing well with premium motherboards hitting new lows ~$100. With that in hand along with modern components, a very nice economically friendly pc can be assembled.
And there are all the new chips begging for attention.
TSMC is going to keep as full a booking as possible, at some point the world could hit CPU saturation...again. Basically if 10MM excess CPU's are produced someone is going to have a tough time.
A sudden shift happens at the CEO-company: "how do we sell this stuff" takes place of "how do we make this stuff".
Intel is going to have to get their prices in line, they were waiting for the moment, maybe it's here. It doesn't look like laptops are going to be their saving grace.