I expect Wii to be roughly flat for Q1, maybe with moderate YoY gains, on the strength of NSMB. Q2 should have significant YoY gains as I don't see the same horrific decline happening at that time of year this time, again on the strength of NSMB. NSMB won't do much to keep Wii up in the second half of the year though, so what happens in Q3 will depend upon Nintendo's Q1/Q2 lineup*, and what happens in Q4 will depend on the Q3/Q4 lineup. I think it'll be good enough to be flat at least, so overall I think we'll have moderate YoY growth for Wii. I'll go with 23 Mill
PS3 should have nice strong YoY gains going into 2010, without a price cut that should reverse as the year ends, but it could last three quarters. If Microsoft cuts their price in or before summer, it won't. Some games will boost hardware on various weeks, but that happens every year and I don't see 2010 having more than before. Overall I think they'll have a slightly worse year since they shouldn't have a strong 2010 holiday. Just under 12 Million.
360 will be weak at the beginning of the year, eventually they'll cut their price, but the console is many years old now and the trend won't reverse. Somewhat over 9 million.
*I expect slow reactions from the market to major software, outside of the holidays
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.