The suggestion that presently unmarked airfield/s should be marked on charts is a dream that won't work. What charts? The lead time for most charts is a year or more and for the WACs it can be 4 or more years. Maybe this might change with EFBs, but don't hold your breath. Many such strips would disappear whilst waiting to be marked.
One might recall the NAS procedures introduced over a decade ago, the MULTICOM (126.7) was the catch all at airfields that did not have a designated CTAF frequency. Seems the regulator has forgotten that over the years.
Yet again, they are trying to fix something that was not broke, with no risk assessment/analysis or education to promote the change.
It is far safer to have a single frequency for use at low levels (below 3000ft AGL) than to have a choice of two or three. Besides see and avoid should be the prime collision avoidance procedure at low levels, not the radio. Most pilots, one would hope, would practice same.