Windows 8 is terrible (seems every other version sucks) and it needs to die in a fire. Games are terrible on touch screens unless the game is specifically designed for it. I'm honestly really tired of some of the recent tech "advancements" that really don't improve anything but get forced on us.

They should definitely have future tablet support in mind if they want this game to be future proof and highly accessible.
Tablet input is not the wave of the future. It is purpose built for certain functions. It's terrible for most games. a mouse and keyboard offer far more control over a game than a tablet. On-screen buttons do not have any kind of tactile feedback whatsoever and make a terrible form of input.

Desktop and laptop comptuers are not going away anytime soon. When a device is not forced to be ultra portable, it can be equipped with more powerful hardware than smartphones and tablets. The bleeding edge will still be on desktop PCs for a long time to come, since it takes time to make that same technology more portable.