I think it will be okay as long as updates are continually released and those updates are supported by the carriers because phones have a rather fast rate of adoption considering many people do the two year contract and phone upgrade cycle.
That's true. Windows is burdened by the fleets of corporate computers running all kinds of proprietary business software, and it must maintain backwards compatibility. Phones get replaced every two years or so, so there won't be much legacy support issues.
Once people load up their phones with dozens of apps, especially business-critical ones, there'll be a lot of pressure to only buy a new phone that will still run those apps.
