If the Wii wasn't out. I still wouldn't have a console, and likely would still be playing PS2 games till a backwords compatable version of the PS3 was around 250, or i ran outta PS2 games. Or untill someone gave me a 360 or PS3, just how i was given a Wii.
I imagine it'd be the same way with most people. The 360 and PS3 i imagine would be about as popular as they are now...
with the DS being more popular since all the Nintendo devleopment teams would of been making games on that.
Actually I might of bought a PSP slim if i didn't have a Wii.
Now later on, I think you could see a difference, when the 360 and PS3 hit their magic pricepoints for their average models and there isn't as much of a market as expected because the wii has already cleared out a large number of cheapskates.
