How low is "low level"? Are you suggesting a blanket stratification? Below, say, 3000ft everyone is on Multicom (unless in area with a prescribed alternative frequency), above that they are on the appropriate Area (ATC)? That would keep circuit chatter off Area.
Or 126.7 becomes the default blanket frequency, and the old Area frequencies become just ATC low level frequencies. If you are using ATC services you monitor both if in an airspace where you need to, if not then just Multicom. Don't bother ATC with stuff they don't need to hear.