@wbmw, This market isn't going away
This is where our viewpoints fundamentally differ. I think the RISC market is going away as x86-64 grows up. IMO, SUN is already planning for that eventuality. There may always be a top top end that requires proprietary chips, but over time (5-10 years), x86-64 will take over more and more of enterprise computing. Just look at the growth over the last 5 years when all that was offered was x86-32.
Once SAP/Oracle/MS/et.al. offer their enterprise apps certified to x86-64 and OEMs offer x86-64 servers with RAS features, why would anyone buy anything else.
You can get a 4-way Opteron that offers superior performance for less than a 2-way Power or IPF system. Similarly you can get two 2-way Xeons that offer higher performance for less than a single 2-way Power/IPF system.
The change won't happen overnight, as chips take a long time to die, so don't expect everyone to knife their proprietary chips anytime soon. Nevertheless, x86 will one day rule the high-end of the enterprise market.