It may not be on every carrier in every region imaginable, but Motorola’s looking to challenge Samsung’s 1 million Galaxy Tab sales with their XOOM tablet. DigiTimes is reporting that they’ll be shipping as many as 700,000 to 800,000 tablets in Q1. If we extrapolate those exact numbers just into Q2 (no drops forecast in the trends, of course) they could match what Samsung’s achieved at the end of 2010, and could double it by the end of 2011. Not a scientific outlook at all, but it’s still something to think about. Samsung and others aren’t sleeping at the wheel, of course, so it remains to be seen if they won’t be met with any resistance in trying to reach this goal.