Detecting and stopping massive point loss on afk/dc'd player

This is a HUGE issue. The ranked structure itself is already so flawed, but to incorporate guarenteed losses from a key player missing the entire game, not even getting to level 2, that cant be hard to detect and reduce point loss. How about, make a vote system, where both teams can vote to have game ended for reduced point loss? Anything at all, just please address the issue. It wouldn't be much harder to detect when a player is intentionally feeding or trolling either. It always happens on a promo game, guarenteed every single promo.