Something needs to change with all of the AFKs.

I've been playing more league than usual lately, and i swear every other game I get into, someone either AFKs at the start (and before you say it, I do know about /remake, just keep reading) or in the middle. I know I could have won a lot of those games without all of the AFKs, and it really sucks because, lets face it, it is pretty much impossible to win a 4v5. I want something done about this, like a more severe punishment. I realize that people have lives and things to do outside of playing League, and staying in a game, but having 30 minutes to kill and starting a game is just outright inconsiderate. The same can be said for those players with really bad computers. It is okay if you really want to play the game; that's great; but if your computer is so bad that there is a chance of your game crashing and you not being able to load back in, that is also very inconsiderate to your fellow players. Whenever someone leaves in one of my games, I know we are probably going to lose. And because I'm not a selfish person like a lot of the other AFKers, I stick around while our team gets demolished in a 4v5 teamfight, and it is just not fun. Now, I was thinking that maybe, if someone AFKs, they get banned from playing the game at all for, say, three hours, on top of the extra 20-minute queue time. What do you guys think? Is that too harsh? I personally am tired of losing games because of someone else's selfishness, rather than my own skill.