What do people/Riot think about making league role-based versus position-based?

As it is right now almost everyone seems to focus positions. People in solo queue main positions, LCS players have certain positions (even though they don't always play in their assigned position) and even seems to balance champions by what position they are mostly played in.

This obviously works just fine, but as League evolves I think maining a certain role over a position offer more possibilities. Mages will know exactly how to position in team fights etc., Tanks will know when to engage and Assassins will know when to strike. Since they have mostly done just that.

You can look at it from another perspective as well. Top, Mid and Bot have barely any differences. It's all about last hitting and harassing your opponent. Jungle is slightly different, because you fight jungle monsters (and they fight back) instead of standing in lane. You could argue that the jungler needs to gank, but you could leave that to others and cover their lane in the meantime or counter-jungle and deny the opposing jungler. And last but not least the support position (!!!), which to me is that person that helps you getting through laning phase by sacrificing some of his or her own income.

This shift is sort of already happening, but instead of focusing on a role people tend to assign roles to positions (i.e. mid = Mage/Assassin, support = Tank/Mage). In LCS however they start to switch around positions somewhat, but they haven't really made the step yet. Personally I'd love to build a team myself around this, for the lack of a better word, strategy(?).

Anyway I wanted to see what people think of it. It might just be to early or perhaps it is happening (slowly) as I described above.

Thanks for reading! :)