But Riot wont bother to do anything about it.
Been a problem for a long while XD.
Other similar games or other competitive games have introduced certain measures to ease the pains of AFKs. Some take away less points, or you take less of an MMR beating. Others give chance for leaving within a certain time frame if there is an AFK w/ little to no consequence to those who loaded up in the game. Others count match as something other than loss and dont take away points for those that stayed (and wins net extra points).
Riot's LoL... it does nothing but punish you for losing, and not much for winning.
They need learn or take a lesson and listen to people's woes (the one problem that can be easily solved, and who cares about Tank Fiora if Riot actually fixes the AFK issue XD). Or try implementing something in a Beta Environment to determine which system works best for LoL.