http://www.vgchartz.com/tools/hw_date.php?reg=Global&ending=Weekly
See how much 360 sold in March in 2006 when Oblivion came out, a very popular 360/PC title. Same month as Ghost Recon came out.
400-500k for the month of March would be a better estimate. To all who read this, please don't take the threads OP prediction seriously.








