My idea for a lethality balance change

Lethality has been a problem since it was brought to the rift. It has been OP on junglers, top laners, mid laners and ADC's. Some of the most problematic champions with lethality are champions like Varus (in the past), Jhin, graves and Jayce. I think that these champions who abuse lethality better than intended users (Zed, Talon, Kha, Rengar etc.) really are the crux of the issue. Here is what I propose: Make lethality half effective if you are ranged, or give diminishing returns for ranged champions. The problem children of this stat are all ranged champions. Jayce with his q, e combo, varus with his q and jhin with his ult and strong autos.

Thoughts?