If Riot won't fix connection issues, just don't begin games where a player doesn't connect.
I've been having the same issue for months now where the game hangs on the loading screen, even if I'm fully loaded, without letting me into the actual game, and at this point I'm just over this. I've been reporting it every time it happens and nothing has been done to solve the issue, so I think that Riot should just add a temporary fix to not even allow games with players that don't load in to begin. It's not fair for players to be punished because of connection issues that are the game's fault.