Riot needs to adjust the kits of most ADC's in order to get what they want
Riot has reworked items in order to make them more of a dps rather than a burst dps class, but for many adc's their kits simply don't support it. This is because most of their damage must be concentrated on one target, meaning that they can't clear waves at all; in order for riot to get what it wants, they need to make all adc's have some sort of strong aoe that allows them to quickly push waves. We see already that ADC's that have that in their kit (twitch, jinx) are creeping back into the meta, but adc's with lackluster clears are still... well... lacking (ashe, Kog'maw, cait). Lackluster clears is a big reason why mages are dominating bot lane; they have a great item like Luden's which essentially allows them to permanently push the wave faster than pretty much all marksman, including Jinx. Likewise, an alternative solution would be to adjust mages and marksman at the same time; give mages items that favor burst (rework luden's) while giving marksman an item similar to luden's which allows them to quickly push waves but not give them huge burst (luden's for some reason does both).