You have to remember that the legislative process and the regulatory process are quite separate, so who is “we” here? If it's the government, obviously the government can change its regulations faster than it can change the law, in terms of going through the process in the House and in the Senate. On the other hand, if it's a parliamentary intention that you're talking about, the only option available to parliamentarians is to amend the law.
You have to think about who it is that you have in mind here in terms of who will be seeking a change. Don't forget, if the government changes regulations, those changed regulations come to the House for scrutiny by the Standing Joint Committee on the Scrutiny of Regulations, so it's not as if it can be done by the government without oversight.