Not for Arena, but I see BTB as a different beast. Obviously the best case scenario would be JIP isn't needed because people arn't assholes and don't quite a losing game. Maybe the penalties can be upped or looked at now JIP isn't a thing. But I'd rather join a game late then be 3 men down on the losing team, or be steam rolling the other team because we out man them 8 to 4.
Joining a game late sucks for that one person. Being half a team down sucks and waters down the experience for both teams. Again, BTB specific, and hopefully the penalties stop the need for JIP.