@Scott agreed. I think it is commendable of Microsoft to continue and try to make a place for its product/service in this specific market segment after years of failures and setbacks (Nokia's acquisition), there are many examples of other companies that just gave-up for instance, Blackberry.
In the long term, it will be interesting to see if a third mobile OS segment can be created. If productivity can be created then, users will demand the creation of a third segment. If effective and efficient resource deployment is created then again, a third segment will be required. For instance, users have to duplicate hardware by owning a 4th gen i5 as well as a Snapdragon 805 and the accompanying hardware such as, RAM and display, etc. Granted, it might require a few generational progressions to take place in hardware architecture design for this duplication problem to be fully addressed but, it seems that Microsoft is trying to address the problem with their cross-platform OS and Surface line, etc.