To think that the new Opterons are too expensive is a mistake, actually. They're at quite a good price. (just compare them to US$4000 Xeon MPs!)
<i>For the market they're meant for</i>, the dual-core Opterons still pack one hell of a punch in terms of price/performance. You can buy an 8-core Opteron system for much less than an 8-core Xeon system, for instance. In addition to that, for a full 8-core SMP machine, you'd typically buy a few tens of thousands of dollars in memory, which kind of makes the price for dual-core much smaller.
For instance, I recently was informed of prices for a single-core 4-way Opteron DL585 Proliant system with 32GB of system memory (a HP representative told me that - we're in the process of upgrading our physics institute's overall computational resources). How much was that? Well, ~US$50000, configured with 2.4Ghz Opterons (850s). If you change that for 865, according to the price differences I saw on the net, you'll end up with an 8-core machine for only US$1400 more. Total cost, US$51400. That's a rather good upgrade for what you get if you ask me! If you were to choose the top-of-the-line 875, you'd pay a full US$54500, if I got the numbers right. Even so, you'll have almost doubled your firepower for less than 10% price increase.
That's a rather good deal, don't you think?
There are many, many, customers who will jump on this opportunity. This is great for AMD. They probably won't be able to meet demand for these systems. They're playing their cards just wonderfully in the server/workstation market, got to hand it to them!