WARNING: Highly Opinionated Post Incoming!
Well, obviously the Wii, 360 and PS3 will be doing fine by this time next year and I'll have two of them by then (Fuck the PS3, paying 400$ for the 360 was bad enough!). The DS will still be putting up high sales numbers because truth be told, it really is the better of the two handheld consoles. You can say all you want about the PSP's graphics, but other than that the thing is an utter piece of shit. The buttons jam easily, the screen is flimsy, the UMD door is super vulnerable to breaking and scratching and one drop on the floor and you'll likely be done with it.
Ugh, there I go ranting.
The only reason the PSP is up there so many times is because it has tons of high profile games. Not many of them are actually all that good, but Gamespot loves Sony crap. Seriously.
Lastly, take that list with a grain of salt anyway. Gamespot hasn't been a credible, honest site in a long time and their opinions are always pretty shitty anyway. But I digress. All the systems I mentioned will be doing fine, but yeah, the original XBox and the Gamecube are just about done. Same for the GBA.