Mobility / safety should have a cost / trade offs, right?
That really is the case, right Riot? In that case...
All ADC's who have any sort of mobility should have lower range ( nothing above 525 ) Ezreal 525 range, Corki 525 range, Graves already has this ( I think it should be 500 range however seeing as how his main tradeoff for lower range is survivability ) Lucian's changes was a step in the right direction, he still sees play but isn't a dominant pick like Corki, Ezreal and Graves. Tristana would start off lower but gain range over time of course. ( 525 at level 1 to 625 at level 18 ) She's meant to be THE late game ADC, so her weaker early / mid game is her trade off for her mobility, same with Vayne ( who lets face it, even with 550 range isn't THAT mobile )
This would also be a boost to immobile ADC's like Varus, Ashe, Kogmaw, who do need love. Caitlyn would become a dominant pick of course, so maybe make her net not launch her back, or give her lower damage?
In terms of mages, a mobile mage shouldn't have wave clear. Viktor can clear full ranged minion waves with his E because he has no mobility, Ahri on the other hand, can also do this but is one of the most mobile in the game. That is something that is honestly silly and you know it, Riot. Perhaps make certain mobile mage spells do reduce damage to minions? This could be a great change to assassins like Leblanc, she shouldn't be able to blow someone up, be uncatchable AND clear entire waves in 1.5 seconds. She's on e of my favorite champions, but since you are giving a similar approach to Veigar and Kassadin ( No champion should be able to blow someone up while having an instant 2.5 second aoe stun, no one champion should be so durable with having so much mobility and damage )
Don't play favorites, if you are going to do this to one group of champions, do it to all or don't do it at all.
Mobility is fun, I agree, but it isn't fun when it crowds out everyone that doesn't have such things in their tool kits. You are close to the strategic diversity you want in mid and adc, this may be the solution to obtaining that.
Assassins should beat out long range siegers, for they have no mobility to deal with them. Long range should beat out the short ranges mobile guys, for they have no wave clear, unlike Long range, and short ranged mobiles should be out assassins, for they can escape the grasps of an assassin and deal with them, unlike long ranged guys like Varus and Xerath.
That's just my 2 cents, don't get too upset over my own personal opinion please. = )


) than I am saying that all immobile champions are weak. I really don't think it's true. Lots of the immobile champions feel pretty strong in the current meta.