the reason for the adc nerfs were that they had the cheapest carry itemization in the game (2600 gold for a completed zeal item vs 3000 to 3500 gold for other classes items in comparison), a 2 item power spike on a lategame scaling build that outscaled other carry types, and were fucking busted for more than a year as a result.
it was literally, win bot lane, win game, lose bot lane, lose game. it didnt matter how well you did on any other champion type in any other position.
if you want to know where adc are headed, they have already arrived. weak early, strong lategame.
the only thing you have a right to complain about atm about is the short overall game times, which prevents them from ever really reaching a lategame. but their power curves are back to where they should be. what we need is 35 minute on average games, and not 15 minute clown fiestas.