Yes, More cores will probably be better for gaming, but it will be a while before we see it, and there will definitly not be anything threaded for 8 cores... anytime soon (nothing in 07/08... maybe 09)
First off, how many people will buy a dual socket mobo? Probably the same amount of people on Fortune's 100 richest people list.
Second, why make games so highly threaded when the vast majority of people still run single cores, only being phased to dual cores now... companies aren't dumb
Third, notice exactly what its threading on the CPU... Graphics/Physics/Sound... well, lemme introduce you to my friends DX10 graphics card, Ageia PhysX or another graphics card, and my good ol X-FI card... oh look, there goes 3 threads already. Last one is world data, maybe even AI, but I hear tell of an AI chip in the near future...
Actually, looking at all this, gaming computers will be ridiculous...
Quad-SLI with another 7950GX2 as a physics SLI card with an additional AI card... BEAST