Serious Question on AFKs

So just finished playing a ranked game and I been trying real hard to get to gold this season. This past game I had a lee jungle who never even connected to the game. The game goes on for about 20 min and we eventually surrender because split pushing is hard to deal with 4v5 and teamfights are one-sided blah blah blah, but the part that really irked me and caused me to ask this question was the endgame screen telling me I lost 21 LP. Why is there just no system for AFKs. Ya sure I can report him and maybe he will be banned and that's fine and all but it won't change the fact that I lost quite a bit of LP because someone on my team was just simply not there. I propose a system where if you have an afk for 15 mins or more the disconnected summoner will be automatically reported and punished and his team will receive a loss prevented. This system should mostly affect the early game since if someone was to try to abuse the system by leaving late when they were losing and just taking the time ban their team would have to survive the 15 mins. I know this may not be the perfect solution and maybe some people will think it is harsh but in all honesty Riot needs to take our ranked games more seriously because I know I sure do.