Balmer logic: If you fail miserably at something, double down.
WHY did they keep the arm model? It splits their OS, office suite, app stores + developers, etc.
I actually think that the arm model is good to keep. It allows Microsoft to change directions quickly if Apple decides to do OSX as an arm product in the future, or it allows them the ability to destroy Apple by making consumer windows arm only and have ridiculous battery life on a tiny device and have the same OS running on everything from PCs to phones to smart watches which is Apples ultimate desire. Really all it needs is an x86 emulator and for ARM cpus to be faster to power said emulator at reasonable speed (which will only take time and in fact they may already be powerful enough to do it now) and it could be fully functional to replace current windows for consumers similar to how Apple had to make a powerpc emulator to switch to intel in the past. If anything keeping Windows RT around could easily be what saves Microsoft and returns it to the market leader in the future. RISC just makes sense for consumer products, and Microsoft could keep standard x64 windows for enterprise