Jojoe, there was a review of the scheme two or three years ago with a number of recommendations to improve it, most have been ignored. Without someone at Ministerial level to drive change, any new review will unfortunately end up like the last one.
Which is why if the scheme does not get reviewed internally it will crumble, I suspect only when the figures decline into serious numbers exiting the scheme will anything be looked at but by then it’s too late for the general folk who rely on the scheme.