The XBox 360 will sell around 10 million again in 2010 and that would be good enough for Microsoft. They may not even have to reduce prices to get that number of sales. Bundling and a good games lineup for 2010 much better than previous years. The 360 has a good chance of doing reasonably well from a sales perspective. The software sales and XBox Live subscriptions, DLC are going to make Microsoft the profits in 2010.
The user base is heading towards 40 million and should be able to reach 50 million in first half of 2011.
Price cuts in 2010??? Natal will be bundled with 360 models and prices of 360 SKUs remain unchanged. Natal will be bundled with new 360s. Natal could be bought separately as well for $60.