Sykar
Arcane
I think in Skyrim easy way of gaining absolute power in all skills is the most important issue. I hope that someday we will have some kind of "short-lasting proficiency" in RPGs: if you use any skills rarely they must be lowered to some "middle" value. So you hardly can be allaround superhero of alltimes - you should practice regularly to keep in good shape.
Yeah, I would like to see 1) a large increase of skills that have differences in selection and use. 2) a limited means to obtain skills (ie you can't master them all, you WILL have to pick and choose as you develop).
Do that, with no fucking respec shit in game, make them cheat if they want that (seriously fucktards, learn how to plan or maybe an atrophy system similar to UO might be workable) and multiple avenues, but a weight of consequences on the choices made. I am sick of games where every option has to be a winner and every choice has to be rewarded equally. If people can't accept that, they just want to be entertained through mind numbing actions and if that is the case.... there are numerous fucktard mobile games ----> that way.
How about having the total amount of accumulated skill points reduce the rate at which new ones are gained? So that the last skill you master takes 10 times as long as the first.
The solution is imho much simpler for the original Bethesda system:
Only Major skills can reach 100
Minor skills 75
Rest 50