@Michael Kelly
Well, I suppose since it hasn't happened yet I don't KNOW this to be the case. Things still have to play themselves out, but I am making these predictions based on the quality of the development tools and technologies available on the platform.
I have spent a considerable amount of time playing with both BlackBerry and Android development using Java, Eclipse, and the BB/Droid emulators provided by Google and RIM. The beta tools available for WP7 are so far ahead of those available for BB and Droid that it isn't even a contest.
Instead of having to learn a totally new API when developing for Droid or BB, developers choosing WP7 will be right at home using the technologies they know using far superior development tools. I have been seriously working with the WP7 beta dev tools for less than two weeks and have been able to accomplish far more than all my tinkering with the Droid and BB SDK's for the last six months.
Not only will you have developers from these other platforms being enticed to WP7 due to its superior developer experience, but they will also attract many from the .NET/C# Windows/ASP.NET world, highly skills developers who would never even consider Droid, BB, or iOS, who will now be able to leverage their skillsets without a significant learning curve.
This will very likely result in higher quality apps that will be able to be brought to market at a much faster rate than apps on rival platforms.
So do I know this will happen? Of course not! But as a developer who has invested a far amount of time with each SDK, this certainly seems to be the most likely scenario.
