It's completely viable, just expect them to have supporting hardware that more closely resembles a cheap android tablet than a netbook (eg 16gb ssd instead of 320gb hdd, tiny battery, very cheap build quality, and odds are MS will release some kind of Windows 8 "tablet edition" which costs next to nothing for OEMs but helps them keep Android/Chrome/iOS from gaining ground quite as quickly).
MS is already offering deep discounts to OEMs on Windows 8 for tablet devices
