Lose my promo because of afks

So i was making my last game of promos (1-1), when i get this. At min 7 Blitz leaves the game. At min 10 Jhin leaves the game. So we were forced to play 3v5, which makes it impossible to even play. And so, then only thing i can expect is that the system punishes this guys, by "giving them a warning". Or better, it would happend anything to them. I think Riot should implement a protection for players like me and the rest of my team in this case, in which, if when the game ends there was a player that was afk or dc for more than 5 min, the rest of the team wouldn't be punished and only that player would. No point in the "oh but u can remake", because i couldn't. Give me your Opinion.
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