User blog comment:TheTobarMethod/ADC Mid....It can work!/@comment-173.245.64.193-20130128201817

I think the idea behind an ADC/Supp bot lane is to make it a kill lane. A good support can help set up kills or deny cs on the enemy carry, who is going to be their main damage source late game. Shutting that down shuts down their damage. It's harder to do that in an adc mid lane because it's harder to set up kills alone (most adcs don't have a snare or hard engage) and they are more susceptible to ganks (you can be attacked from all lanes at once!). At least, that's what I think the reasoning behind the current meta bot lane is.