It is long overdo to be able to logically climb the terrain of Tameriel. Nothing is worst than hopping up hills or being confined to a route. To truly encompass a large scale realized world and terrain, the interactivity has to match and make sense in accordance with physics and in game laws of physics. I rather see my character grit and fatigue in pursuit of a dragon he is attempting to slay at the highest peak.

TES2: Daggerfall had a climbing skill. Wouldn't mind to see that return.

In any case, please use http://www.gamesas.com/topic/1392164-official-beyond-skyrim-tes-vi-10/ to discuss future Elder Scrolls.