"Make a bot take over when a player AFK's"
While this seems like a good idea in theory, there are multiple things wrong with making a bot take over when someone AFK's.
Firstly, dozens of champions don't have bots. A lot of champions like
and a lot more don't have bots made simply because it would be so difficult to make an AI that can use their kit better than a bronze 5 first timing them (No exaggeration). So would the bunch of champs with no bots just not get an AI or would they get an AI that ints?
Secondly, bots suck. Think about it, would you rather fight a 4v5 where one player isn't giving any gold, or fight a 4v5 where one player is giving significantly more gold than everyone else? Even worse, people would be able to abuse the bot by killing it 3-4 times, having a tank or something die to it to reset it's gold, and just farm crazy amounts of gold that way. (If someone wants me to explain that more clearly just say so, I'm not sure how well I worded that lol)
For me, the best way to deal with AFK's is rather simple. Make it so no one in the game gains or loses LP, except for the AFK who loses triple what he normally would have lost.