I predict advances in location technology and autopilot logic will make ILS and the whole panoply of IFR operations redundant in a few years. Assuming straight forward design of the approach, any experimental bug smasher will have the capability-whether CASA and Airservices approves it or not. This phenomenon is called “being overtaken by disruptive technology”.
Anecdotally I’m told that some in the RV community already toy with IMC conditions without any approvals.