I still like the basic idea of running one application for ALL size devices - did not say "App". Like Dark said, if I can run full size applications on my phone, then good for me. Just because the interface on Win 8 sucks, that does not mean the interface on the application must suck. I've personally wrote applications that adapt to many devices with different sizes, different performance, different interfaces, different input devices. It's not that hard, like making a Web Form that runs on many different browsers, mobile and desktop - many different User Agents.
No plans to be a SDET.