I was struck by a short blurb I read in The Economist. They claim (or rather, the analysts they are quoting claim) that each console will have its day in the sun, and that the PS3 is on track to surpass the Wii in 2011.
Now, I think the PS3 is a fantastic console. It's got a ton of power, it's got features that blow everything else away. But let's be realistic here - people aren't stalking UPS drivers to find one.
I think sales of the PS3 are going to continue to improve, especially as cost-cutting and feature improvements come into play, but I think it'll be doing well to catch up to the 360 at this point, never mind the Wii.
Of course, I'm not an analyst, so what do I know?