Yea if MS exited the HW game then WP is pretty much over unless they could somehow convince Samsung to support it. I find it odd to suggest MS to abandon devices.
MS needs to go into...
John Savill's Microsoft Azure Master Class
Join John Savill for 12 hours of comprehensive Microsoft Azure training. This master-level course will equip you with everything you need to understand, evaluate, deploy, and maintain environments that utilize Microsoft Azure including hybrid scenarios.