The thing is how do you stop players from using the "exploit" if there isn't enough time to even fix it to begin with? Sure you could report them, but really as long as it stays in the game there isn't really much you can do to stop players from taking advantage of it.

By the time the fix gets done, which is 5.0 from what they said, the number of players actually leveling BLU won't be as high as it is now anyway, so it would be a matter of too little too late isn't it.