This may seem too simplistic, as I am often accused as part of my troglodyte upbringing, but to put it simply: if the Government does not change one comma of the aviation act and an accident occurs during the life of the parliament that didn't do it, the opposition and the public will beat them to death at the next general election for not "meddling with air safety" with the perceived and demonstrated regulatory problems.
I think we give governments and bureaucrats the benefit of having more sense than they actually possess. Either, nay most, of both classes wouldn't survive in the "real world" where common sense, economy of effort and practiced historical sense would prevail. (Did I mention economy of taxpayer funds), Sorry...