Just as the title says, provided all of these come out in 2010 which do you think will sell the most?

I think Natal's success depends on the software. If it has great software support, it could blow the doors off of the competition. If not, dead.

 Sony's Gem could do well, but I'm not sure about the adoption rate of current owners. Also cost could be a limiting factor as well.

I honestly think that the vitality sensor can sell the most. The Wii has somehow maintained that "cool" factor, with Wii-Fit selling like proverbial hotcakes. I could see Ninty with the proper marketing and the right software, a la a new Wii Fit type software that really keeps track of your progress, selling it in scads. What are your thoughts?

vitality sensor, Nintendo is gonna find a way to sell it, and then Natal since MS will probrably back it up a lot, and the wand might end up as a clone of the wii-mote for most people

When are all three going to be released, that will make a big difference as well.

Natal is late 2010, PS Wand/Gem is spring 2010, Wii Vitality Sensor ?????

Is this even a question worth asking? I think its glaringly obvious that it'll be the Vitality Sensor and I don't think it'll have to sell that much to win either.
I'm not calling your poll stupid or anything but I sincerely hope most people choose option three, lest I lose all faith in this place!

I believe they said the vitality sensor was 2010, at least hinted at it. Maybe I should have said "in their first year", but I wanted to see if anyone thinks a late launching Natal could beat the Gem, or if the Gem will win by being first, etc.

If its in their first year, the Vitality Sensor will outsell both Natal and the Wand combined.  If it was just 2010,  it would still probably be the Vitality Sensor but the Wand could have a shot at it if it released late enough

1. Wii sensor, due to the Wii's install base.
2. PS wand, It will be on the market for a longer time than Natal and the head start will help it stay above Natal. Also it should start catching on by the time Natal is released.
3. Natal, Holiday release will help it sell.

I have enough faith in humanity to think that very few people will buy the Vitality Sensor, since it doesn't actually do anything remotely useful. It's not like MotionPlus, or the Balance Board.

I said NATAL, thanks to Microsoft's marketing and inevitable promotion/bundling. But it depends on the price.

The Wii Vitality sensor.

It's likely to be much cheaper than the other two and knowing Nintendo it is likely to packed in with the first major game it supports.

@Kantor: you know what the vitality sensor will do and how it will be incorporated into games?  I'm as sceptical as the next guy but we just don't know enough at the moment to say that it will be useless.

Like Kantor, I think (read: hope) not the Vitality Sensor.

Gem has the headstart, but Natal has the mainstream media behind it and a 360 relaunch marketing machine, so I'll take Natal.