I've heard that a lot, but I don't quite buy it. Thing is, distributed computing is the current big thing in architectures. If you can't scale your architecture across multiple commodity PCs, you're in for lots of pain, regardless of whether it supports multiple cores or not. Nobody wants to have to buy a SunFire just because their website got big.
If you have distribution, it's no big deal just to run multiple processes on one box and let the OS handle concurrency. You can treat each processor like it's a separate machine, let the OS handle scheduling, use your architecture's distributed-computing features, and silently take advantage of the blazingly fast IPC between different processes on the same machine.
