While I cant talk about the actual programing behind it, and how much time that takes; I don't think there would be any problems with scaling the 5 levels as far as difficulty is concerned unlike changing a 20 something FP to 55 like they did. But regardless to all that, you would think they would make time to change it because right now all the time they spent making those FP is pretty much wasted now because they wont be played nearly as much as they would be if they were endgame.