My primary concern is that many (most?) VFR aircraft have at most one VHF radio fitted. It's absolutely normal to have a situation where monitoring two frequencies would be good (eg. approaching or departing a non-controlled airport where you probably want to hear both the CTAF and area frequency). Are we now going to see a situation where someone departing from (for example) Cootamundra immediately switches to the area frequency to announce (as legally required) their intended climb through IFR flight levels, and therefore fails to (as legally required) monitor the Cootamundra CTAF? Or how about somewhere like Goulburn, where on takeoff you probably want to announce on the CTAF, Canberra Approach, and both of the relevant Melbourne Centre frequencies (as YGLB is on a boundary)? Do you pick one and pick up a $15K fine for not monitoring the other three simultaneously?