Please don't make crit ADC's mandatory again. For real, I don't think most of us care that the class isn't seeing play.
Maybe you need to rethink the whole "right click to win class" as a whole. It seems if they're not completely overbearing and overpowered then they don't see play.
I for one think this new meta of double bruiser bot, double support bot, double mage bot, melee adc with support, mage with support, jugg with support, and further stuff like that is far better than the previous age of mandatory Marksman + traditional support combo.