Riot, Please Tell Me What I Could Have Done

So, about twenty to thirty minutes into this game, our ADC afk'd. I figure, eh, that's no big deal. We are decently ahead, and both I and the support are building full AP so we should be able to get towers.

Check it out. Our team had 7 dragons. 2 barons. We gave up NOTHING. I as a jungler had perfect objective control. Our Kha'Zix was 28/5/9. We were the better players. We had more skill. We had more towers. We had a 2k gold lead DESPITE a whole member of our team being unable to CS for 30-40 minutes!

And still! And still, we lose, because when we push to secure an inhib just before 8th dragon spawns, Gangplank teleports to a ward somewhere and rushes into our base and kills our nexus.

Here you go, Riot. The absolutely, one hundred percent, perfect 4v5 game. Not one of us could have stayed behind to stop them because none of us could solo GP in the late game. So we did what we could with the resources we had and we got destroyed.

So tell me, Riot. I understand you're constantly working on ways to PREVENT afks, but when they happen, why don't you give us an out? Nothing that I do. Nothing. Nothing. NOTHING. Will make up for being down 7k gold, for being down a body who can push waves, for being down 2-3k health.