I agree that Skyrim's snow areas/mountains became somewhat dull after a while, but at least they were still nice to look at for the most part. The potential for dullness of a desert is much higher compared to other types of landscapes, because deserts must be mostly barren and dull by definition. Skyrim was sometimes dull but it was visually beautiful with mountains, waterfalls and rivers everywhere. It's hard to make a huge desert visually beautiful. Sure, there will be an oasis here and there and some other landscapes besides the desert, but the desert is really dominant in Hammerfell, so the landscape would be a dull wasteland for the large part.
I'm really not looking forward to exploring this kind of landscape (Hammerfell in TESO):
http://www.uesp.net/wiki/File:ON-place-Alik%27r_Desert.jpg
http://static.elderscrollsonline.com/assets/img/cms/media/screenshots/71583963e5ae546fb8.jpg
That would get dull like in 10 minutes. We already have the Fallout series for the wasteland setting.