He keeps getting this minor, ALMOST QoL buffs. His Q damage went up recently, just got his missile width on R widened a bit... These things are adding up. I notice it when I play him. These sorts of minor buffs are exactly the thing he needs, imo.
Your idea is nice, too, though. If he does get a bigger rework, I wouldn't be surprised if something like this came through. In my opinion, adcs all need some kind of escape mechanism. I don't know if this kind of mobility constitutes that, but it certainly a fresh idea. My only complaint is that it's very similar to Jinx's passive. That might prevent implementation of this idea. Sure, smaller buff, and easier to proc, but still a similar concept.