I'd argue that ANY Lane can unrecoverably end the game. As an adc main who's gone 8-0 in 10 minutes and been unable to carry due to top or mid going something like 0-13, I can assure you that if any Lane is feeding hard it's very hard to make up for them.
Honestly I think bottom Lane is the least offensive of the 3. Top and mid both automatically have a considerable level lead on bot and jungle. If bot Lane starts feeding you can catch it early and stop it pretty easily as the jungler is slightly higher in level and mid/top are considerably ahead in levels. If a solo Lane is feeding, no one other than the other solo Lane can even challenge the enemy due to level differences. So if one solo Lane is feeding and the other is even, it's ggwp Pretty much.
Also, recall that bottom Lane has 2 players. If they're both feeding and both are really bad players, it's no different than any 2 roles having bad players feeding. It's relatively easy to turn a game where you have just a bad adc or just a bad support (considerably easier than top or mid), it's really hard to turn a game where 2 of your 5 players are bad and feeding in any roles.
Anyways, to answer your question:
First time they both die in Lane (or once they're down 2-3 kills to 0), gank with a solo laner and jungler 4v2 next time they come back. Mid has waveclear and roam ability, top has teleport. Get the 4v2 double kill then do Dragon.