Seems unlikely, although I think 360 will perform well in 2010. But dominate?
1 - The Wii still dominates in terms of sales, even when down YOY
2 - Speaking of which, the 360 was down YOY and would likely have seen worse YOY performance except for some extremely low cost bundles/deals in US/UK during late November/December
3 - The PS3 was the only home console up YOY and next year it sees more big franchises hitting the platform for the 1st time vs sequels - this is important because sequels sell well but don't drive as big a sales spike as 1st iterations on a platform
4 - Natal will be launching late in year, allowing Wii to eat up more marketshare for motion control orientated gaming before it launches.
5 - It is possible that Sony may get to market first with motion controls, allowing it to have 'first dibs' at adding motion controls to an HD console (although in theory it already did with the Eye, it just forgot to include any decent games).
So, looking at current trends regarding YOY performance, the fact the PS3 and Wii are essentially 1 year 'younger' in the market, the fact most big 360 exclusives are sequels vs 1st iterations, and I find it hard to believe it will dominate (at least not without some form of price drop). I also think Natal is likely to arrive to late to make a huge difference, although that's harder to call.
Going on numbers I think it's like Wii will again sell the most in 2010, the PS3 will probably nab second place, just, with 360 in third in terms of total console sales for 2010.
Try to be reasonable... its easier than you think...