Ask HN: What is the future of enterprise applications on Windows Mobile 6.5?

Before you answer "dead" I just want to point out some things. Maybe I'm wrong in my thinking and I would love it if someone can tap my head and say so but I was just wondering, since a large number of companies still build custom inventory management systems and other enterprise apps for Windows mobile 6.5 what will happen to those?

iOS doesn't seem to be a viable option for this business model. The fact that unless you jailbreak an iPhone you can't side load apps on to it is an obvious issue, let alone the approval needed by Apple to get it on an app store.

Android allows side loading and seems to be the only obvious answer to building a simillar business model using a modern smartphone OS. Device variation and what not could be an issue. In a practical world there'd probably be the users buying the application arguing over why they want cheap low end devices instead while developers would be pulling hairs trying to explain that they need decent touch screens and enough memory and screen size etc.

Windows Phone 7 suffers from the same problem (?) of side loading.

Given all of this are Windows Mobile 6.5 devices still the really viable answer for customized enterprise app development?