Win 8 tablets is spreading so and steam, no doubts, can kick out native win 8 store!!! Just need optimized big picture mode for touchscreen (touchpicture? scratch? ) Some games already have touchscreen support. If steam API will have some overlay touchscreen gamepad - win store dooooooooooOOOOOOOMED!!!!!!!!
Anyone with win pad and hunger for steam on it - THUMBS UP!!!!!