Should crit damage scale like Lethality?

I'm not one of those who rant about the prevalence of adc currently, but if crit damage scaled similarly to lethality, it would reduce the early power spike given by purchasing crit items, while preserving late game damage potential. If crit damage started at 150% and scaled up to 200% at lvl 18, it would compensate for the current strength of supports. At least it would be a quick and easy fix for the problems that the current crit design poses.