Immobile champs

With Kalista coming out and with her ability to being able to jump after every auto I feel like we should talk about champs who are glued to the ground. With all the recent super mobile champs that have come out it just gets more risky and less rewarding to play champs without a jump or dash or even a speed up. It seems like what ever a immobile champ a mobile champ can do just as well if not better. Lets look at ADCs because this is the role that shows this the most. The five most played ADCs can all get over walls except one. Lucian, Kog'Maw, Tristana, Caitlyn, and Corki. Why play Ashe or Varus or even Draven when they 4 mobile champs do what they do but better and safer? Brand and Vel'Koz are other good examples. They both hit like trucks but have no way to jump or dash. The immobile champs that are popular have something that makes up them being immobile. Xerath is immobile but has really long range to help make up for it. I'm not sure how to fix this. Even if you make the immobile champs hit like a nuke all that damage means nothing if you get blown up by a mobile champ.

TL;DR Immobile are become more and more obsolete with ever new mobile champ released.