ADCs are still being picked 90% of the time, despite there being better options(winrates backing these things up) goes to show that Botlane players are wanting to play ADCs; why else would they still pick Ezreal with his 47% winrate?
Or how about the fact that globally, Botlane as a role has dropped in playership since 8.11 from being tied with midlane as the most played at the end of season 7(proof right here using the Wayback Machine http://i65.tinypic.com/2it4do8.jpg ) to being lower than support as of right now(again, proof: https://www.leagueofgraphs.com/champions/main-stats/all ). If this new "diversity" was what botlane players actually wanted, it could be argued that the play rate of bot lane would go up, not down. Instead, it has decreased pretty exponentially just since the end of season 7.
So my question is, who was this diversity for? Because its patently clear that a good majority of botlane players did not want it.