What if Ability power only effected Abilities and Attack Damage only effected auto attacks?

In my opinion, the reason i am seeing full on AD comps more and more often, is because they have the best of both worlds. Their abilities scale off of attack damage while also improving their auto attacks. In addition, Riot just bats an eye at their item discrepancy BETWEEN THE TWO TYPES OF DAMAGE, AP vs. AD. They introduced another AD MR item with a pretty powerful active seeing assassins seem to be top meta currently. And yet, AP is stuck good ole Zhonyas, while powerful if used correctly, really doesn't help much unless with proper team play or CC. Plus, they nerfed the cooldown lol. I think AP champs, while still the predominant, mid laners (OH great one out 5 positions), will continue to fall off until some kind of compromise can be made to balance the two damage types.