I wouldn't rule out that games will start using multiple threads. There are lots things you could do in seperate threads e.g. physics, ai, sound processing. Running those in parallel could help a lot, but of course you have to add in the administration costs and latency for resources, threads waiting for each other, etc. Also parallel programming is really hard. It's no good if threads end up waiting for resources or output from other threads more than they're working. Even if you design with the best foresight and intentions, you may still end up with a lot of this in the end.
On the other hand, a dual core means your folding@home will still be maxed on one core while you're playing CS:Source, which is pretty cool.
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