I really don't think we'll see fielders robbing Peter to pay Paul. There were only 3 sixes hit in that innings, with five times as many fours and the number of balls collected in the outfield was about twice as many again. Sri Lanka would certainly have lost if their plan was to save sixes with players outside the boundary. It's increasingly common for players to juggle the ball around the outfield so they can take a clean catch, but you still have to be very skilful to do it, so what is wrong with that?