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While we're gazing into the crystal ball, we might as well take a look at future computers. It's conceivable that we might see motherboards with two PCI Express x16 slots. That would open up the possibility of using two graphics cards in the same system, paving the way for four monitor setups. Switches for this kind of solution are already in the works.
Two cards, twice the speed? Sure, such a dual-card configuration could boost 3D performance, if the driver can distribute the work intelligently between the cards. The trouble is: the images rendered by the second card would need to take a detour through the system memory before being displayed. It seems doubtful that this would work fast enough, due to the inherent delays and latencies involved. Then again, maybe we will see solutions using direct connections between the cards, similar to the Voodoo 2 SLI setup at the dawn of 3D accelerators. After all, it worked very well then, why not today...?
There is another thing I'd like to say while we're on the topic of using multiple graphics cards in one system. It's a fairytale that there can be only one AGP slot on a motherboard. The AGP 3.0 specification allows for what's called a fanout bridge, which would allow a second AGP slot. So, two-card systems have been possible for quite a while now - sadly, they're just not being implemented. I wonder, is this for lack of demand or other reasons?
If you'd like to read up on the AGP spec, you can find more information here .