Awww, you mean parts of the monolith would have to compete on merit with all the other companies that are having to compete on merit?
What a terrible shame...
It will be a terrible shame when I no longer get real-time traffic on the small streets, yes.
I use OSM multiple times per week, but I still start GMaps anytime I need to drive somewhere.
Google Maps is essentially TripAdvisor with better search, but fewer reviews. In addition, Google Maps is probably the most used GPS routing software these days.
They would do fine standalone, either following a path like TripAdvisor or Garmin or both.
It and especially the more niche google products seem to be provided as a value add to their other services (i.e search in this case).