Given what happened with the pre-order, Windows 8 in general is going to sell a lot of licenses. In addition, the lower prices for upgrades and vendors slashing costs even on OEM licenses.
Yeah i think Windows 8 will do just fine...Surface SEEMS to have some heavy interest, but post launch month sales will be more indicative.
Windows 8 use on a tablet has been mostly positively previewed so I think much of the praise will come with the new hardware being released. Windows RT will probably be docked for still including the desktop in some reviews i'd imagine...though it doesn't bother me since if i need to start diving into menus in my productivity apps, i'm probably going to prefer to be on a mouse and keyboard anyway.