AFKers and DCers

So why hasn't Riot attempted to do something to the people that are victims of this. Sometimes it happens because someones internet goes down, or someone decides to be a jerk to their team, so everyone needs to suffer for it? Is there no way to implement a system that measures how long someone has been disconnected for? and if it exceeds a certain point give the rest of the team some sort of cushion if they lose the game so that they don't tank their LP. 4v5 games are not the easiest things to win and if we lose we tank like 15 to 20 LP? How is that fair to the players? Now i'm not saying to punish the other team and reduce the LP they win or anything like that but its very disheartening to sit there, and play a 30 minute game that we cannot win because someone DC'd and the team won surrender because they are too stubborn.