At this point in time, why not just redo the game and make it a true Sandbox type game. Get rid of all Skill Lines and Passive Combinations as well as Racial Passives. Rename Racial Passives to Character Trait Passives. Going forward, when a character is created, they can choose any race and then up to 4 or 5 Character Trait Passives and one of those must be an experience increase one.
The Skill Lines would be replaced by just Skills and all Skill Line Passive's would just be replaced by Skill Passive's. The Skills are leveled like they currently are and can be morphed. The cost to cast is based on the higher of mag or stam or health depending on the skill. Skill Passive progression is level based. The Skill Passive's can be based on gear type, Skill's, and max or min resource. Crafting would be its own separate system and would follow the current path with the addition of new crafting lines, link Tinkers or something else.
By this method I could make an Argonian Tank with current Nord, Redguard, Imperial, and Breton racial abilities increasing experience with a Sword and Board.
Just a thought is all