When a player quits a game or drops due to connection failure, why not simply remove that player and open up the game so someone else can join the game in progress.  Do not replace with AI they do more harm than good.  The incoming player could select their demigod and begin at the avg level of their team.  Give them the gold they would have earned over time (no kills).  If the disconnecting player tries to rejoin, simply have them start where they left off.  I think these games could be popular as many people dislike the first few levels of play.  We still need a conceed option which I think should require a majority vote by the team.  Flame away or expand on the idea; your choice.