Sure, you can walk into just about any home in the country and find one of any number of different consoles. Maybe even two. Rarely will you find all three current-gen consoles, though.
Anyway, let's leave Wii out, since you can't make and sell a game without a publisher, or at least a license and a dev kit, all of which are well out of reach for most indies. And PS2 may still be quite popular, but... well, you can't sell games on there either so it's a rather moot point. Likewise with the PS3... there is no XNA or XBLIG equivalent. You need to get a license and devkit in order to develop there as well. At least, as far as I know. I don't know much about the PS3, but I couldn't find anything out there like that. Sooo... that leaves the 360.
And yes, if you total up all the Wiis, PS2s and 3s, and 360s in American households, the number probably outshines the number of smart phones out there. But we're not totaling up all those consoles because the only viable dev platform for indies out of the lot is the 360, you can sure as hell bet that game sales on the iPhone are a hell of a lot more common than game sales on XBLIG.
I brought up those consoles because you questioned the broadness of the console market vs. cellphones. Sure, if you base the viability strictly on how many cellphones have been sold vs consoles it would seem that cell's win, but the important factor in the equation is figuring out how many people with cellphones are actually playing games on them and how much they're spending when they do. I haven't heard any eye-popping sales numbers from that sector for single games or heard of any super blockbusters that rival major console game numbers. I would think if so many more people were playing games on them there would have to have been one huge blockbuster game. Last I heard, Tetris was the highest selling ever on cell's, but all that is is a casual remake of a game that was already huge.
And the point is rather moot but I was under the impression that there are 3rd party programs like Torque and such that can publish on XBLIG too...?
Yes, but you still have to know C# to make anything presentable.
Also I don't mean to be rude but being able to publish to Zune and Windows Phone is... well, it's kind of like saying you can publish your game on a unicorn's butt because really who the hell owns a Zune or a Windows phone? So in that regard "Being able to make games for 4 platforms" is really just two platforms, and since Windows is one of those platforms in Construct already then that leaves 360 as your second and I've already put too fine a point on why I don't think that's really a priority.
Zune has sold about 3.5 million units, not big but it's something. Windows Phone isn't out yet so of course no one owns it yet, but that will change quickly. But that's all beside the point. The point about this is that you can create a game in xna that can be translated--with the proper know-how--across 4 platforms. Take the Express Game Maker for example; it lets you make an xna compatible game and either deploy it directly and start the process of selling the game on XBL, or you can export the code and mod the code to translate to any of the other MS platforms. The price of admission is lower than going the Apple route. I mean, to be certain, getting your game on the iphone is going to cost you a lot more than the $99 Creators club fee from MS, and if you wind up needing some Apple hardware, then you're really in for it.