The one thing that plagues this game more than anything for me

I find that I can't enjoy my games because I never know when one of my 4 other teammates is just going to suddenly quit the game and never come back. I don't mind losing for a good reason, but it feels like crap playing this game never knowing who is going to just leave. This isn't about player behavior specifically because it can affect people who aren't trying to leave, but I find the number 1 most aggravating experience to be having to always be under the constant threat of an afk. I know the ratios and percentages and all that support skill>afks but this is only about the enjoyment of the game. I feel like having to sit and play a 4v5 is just so irksome, and I understand it happens to everyone, including myself about twice a year (for clarity, I am forced to afk twice a year max due to unforeseen problems such as service interruption or Internet outage). I just wanted to share my opinion on why league of legends is not the most fun thing I can do with my time. At least in single-player games no one afks, or in some games you can replace an afk or whatnot. There's probably never going to be a viable fix for this.