If they're going to do this, they'll HAVE to make sure the exams improve. As in so they're always the same difficulty, on a spread of topics, with no **** ups (as is becoming more and more common). They should also have to change it so its not (For some exams) 4 marks between grade boundaries.
I hate that they think if someone retakes and improves its because they were lazy and didn't work originally or whatever, many people improve just as a retake is a lot less scary than the original exam. Also i hate that they're saying it'll help improve peoples ability in the work place. Last time i checked, in a job i wouldn't have been caught out by a trick question, said a couple of things in a different way to the exact words they use in a mark scheme and have received an entire grade lower!
I do agree that a limit on retakes would be good, , so if a paper goes wrong originally, it gives people at least one more chance. It would also prevent people (Which i see all the time) deciding to do a retake and then not working for it at all because 'oh well i can retake it again'.