My two cents..... I voted M$, Nintendo, Sony. My reasoning came from three categories; price, release date, and features.
M$ will finish first because they won over quite a bit of people, including my self, with the xbox and they now have a fan base. Just as Sony did after the Play Station. My second reason would be that they hit the market first and the average consumer can't afford more than one console. The 360 isn't going to be as featured packed as the PS3 but let's not forget about LIVE. I think LIVE will dominate for years to come. One last thing that will help secure M$ at the top is that Sony will not have as many exclusive titles as it did for the PS2, which in my opinion is the biggest reason the PS2 stayed alive after the release of the xbox.
Nintendo will finish second because the price on it just looks too good to pass up if your looking for something new to do. Nintendo also has too many loyal fans, including me, to let it pass for that price.
As for Sony, I can't find anything go to say about it except that it's going to be one bad mother. It will top the 360 in performance but at the same time in price. The price tag on it just doesn't seem like something I my self would just pick up, let alone save up for. Trust me, everyone in Japan will have one but Japan doesn't make up the whole consumer market. The last point is that it will hit the market last.
In conclusion, the biggest reason I think M$ will finish first is that it will hit the market first. Sony will finish last because it cost too damn much and Nintendo is stuck in the middle because it's a bargain. Maybe my rankings are bias because I like Nintendo for everything it has done but I still stick with my stance as M$ finishing #1.
A quick thought I had after posting is that I'd like to see the same poll and it's results on a Sony and Nintendo site.......