I know it doesn't fit the typical mold of an Android device, but this phone is going to sell well.
Firstly, because there are still plenty of people who have heard of Android, but have yet to either make the plunge, or have a contract renewal. There are plenty of all touch-screen devices from HTC, Motorola (1), and Samsung; and for the hardware keyboard type, there are now a few options with G2 coming along the Droid 2.
So far, I'd say Android has been able to capture a younger audience. It is an OS that doesn't exactly scream business, and besides, BB has held a stranglehold for a while now. Like others have said, this is Android's opportunity to move in on the business/professional front, hence the "Pro" nomenclature.
It doesn't have the layout for an app like PSX4Droid, but that doesn't matter; this phone is going to be the first viable "switch" option for a lot of BlackBerry users on Verizon. It suggests familiarity and stability, with a bit more of a "business look," for the average BB user.
Android is already doing just fine among the tech-savvy, now it's time to adjust the scope and chip away at RIM. I think having this option is a really smart idea by Motorola, and expect at least 1 competitor in the future.