Finally a good way to lessen AFKers
I just want to address this AFK problem. I recently had to play 2 promos because of losing the first one purely due to AFKers. The first game was questionable whether we could win or not and someone ragequitted. But the 2nd one was purely troll, the duo was flaming bot lane for doing badly but we were extremely far ahead. I was at one point 15 and 3 as Kassadin and they had no chance. The duo purposely AFK to throw the game to spite bot lane.
Similarly even though I won my 2nd promos the only loss I had was AFK jungler who left at lvl1 because he was being forced jungle. What's strange is I only meet these people in promos. perhaps maybe Riot purposely match you with people who AFK often or something.
Anyhow AFKers should lose 3 times the LP and MMR decay. Other teammates LP loss should stay the same though to prevent abuse. I understand if someone AFK in a normal but in a ranked is just ridiculous. I know there are people out there with legitimate connectivity issues, or sometimes you guys get bugsplat/firewall error and can't reconnect. But the majority (90%ish?) AFK I see is either through rage or pure trolling.