Ouch. I haven't seen a lot of companies make announcements like these. Usually they build low-quality apps and just leave them to languish on App World. I've heard that it's actually more expensive to develop an app for them than other platforms? Does anybody know the relative manpower needed to develop for each major platform - iOS, Android, BlackBerry, Windows Phone?
Probably just one dev to maintain the platform, but it's more than that. You then have the business stakeholders, you have the QA resources, you have the designers, etc. When you add the whole thing up, it could be a resource drain. It's a lot easier to scuttle the whole thing than have to worry about it every time you want to introduce a new feature/design.