I look at it the same way I do when the automotive manufactures were faced with unleaded fuel; they didn't spent all their time trying to retrofit cars with the older engines, they just moved on, taking on the new challenge. The consumer took a bigger hit back then, and now you have 10% ethanol (and efforts are being made to increase that percentage); I haven't had an engine that runs right now that its impossible to find stations that doesn't have ethanol included.
Trying to retrofit older phones for a technology they will never be fully able to power, may just be slowing MS down and their ability to fully focus on future mobile devices.