x86 Macs will still look cool and they will still have the same OS running on them. Unless you are a developer, there is no downside. Even then - can you complain about a better market share?
I wonder how they are going to control the hardware so only MacOS X will run on their X86 Macs. Some of the other postings that I have read today say the these X86 Macs don't have OpenFirmware.