Riot, Will you update old skins?

I'm looking to get a Rioters comments on this topic and would love to get a response, so here goes...

Let me start off by saying that while there are a great deal of old skins, I believe that the ones that are the most obviously outdated are some of the Legendary skins. Now I own a lot of Legendary skins, I'm such a sucker for them, and I know that your overall quality of skins has risen greatly over the years; however, some skins have been left behind.

For example, in my case, the Corporate Mundo and Demonblade Tryndamere skins are very outdated, especially when you compare them to recent examples such as Mecha Zero Sion and Final Boss Veigar (my personal favorites).

So that leads me to my question...Will you ever make a point to go back and update some of these skins or will you wait and do it case-by-case bases as you update champions visuals?