The problem of Windows RT is the apps. There are not specific apps for what most people do on tablets.
No Facebook, Foursquare, Instagram, etc.
Sure, you could access Facebook very easily in your web browser, but having a dedicated app is much better and suits most of the consumers. Of all my friends with smartphones, I’ve never seen anyone go to facebook.com on their mobile browser, they all use the Facebook app on their phones.
Once this app problem is solved, Windows RT will have a good future.