How long before full frame digital SLRs are the norm

With the popularity of Canon's EOS 5D mark II and Nikon's recent launch of the FX-sensor based D3, D700 and D3X (...drool...), is it just a matter of time before full frame sensors are fitted as standard?

There's no question that the images from any of these cameras are, on average, a large step above their more common APS-C endowed counterparts, so will consumer pressure drive manufacturer's to include 35mm frame sensors on all the models, or is this just too great a differentiator between professional and prosumer models?

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