The only thing I am very nervous about is the W10 version for tablets (RT). I hope they let the desktop UI as an option for all the users actually using both UIs.
I for example use the modern UI quite often when using my Surface as a "touch-tablet", but the desktop UI when using it with the typecover. It is just awesome to have the windows explorer and all the settings (network drives, control panel and so on) on my surface. Especially when I am not at home, but need to work with hard drives and network drives for exchanging data... Having the desktop office package on my Surface + Typecover is a a huge bonus as well... I always use the "desktop" office...
Other than that: do what you want, Microsoft