you are wrong. OS X didn't ship as an optional install. It shipped as v 1.0 standalone product long after OS 9.2.1 was shipped. I know because I am a real Mac user and I bought OS X on day 1. Classic utilized the existing OS 9 installation for running OS 9 apps if necessary but OS X never required OS 9 for running OS X apps. But of course, how would fandroids know
Apple is doing exactly what it did with OS X. It shipped standalone v1.0 product, Apple Maps, which replaces Google maps, another standalone product. In case, if one needs to run additional apps for whatever reasons, fallback apps are plenty and available, starting from Bing, a free standalone app and tens of GPS and map apps, and a web version of Gmaps. In next iterations of Apple Map it will be able to leapfrog whatever advantages Gmaps had because Apple Map is built into system and is a core extension of it, and therefore, can have deep integration with OS which would be never available for Gmaps in whatever version it might come (if it comes).
For example, there will be deeper integration between Siri, Facebook, Twitter and AppleMaps; AppleMaps and camera apps, AppleMaps as a standalone locational search app, partially replacing Google search for POI such as shopping, entertainment, AppleMaps as a backbone for Siri and reminders, etc.