that is pretty much exactly what they would do if the Google Play store became unavailable to them AND they didn't want to buy a new phone,
Not what happens with Android. Different business model though. Google play services are detached from what version of Android you're running. There are some apps with OS requirements, but as long as Google's App suit is kept up to date, even old Android's who are on 4.0 or 5.0 will be able to run on the device.
it's just a different way of updating. Google I think recognized how **** the carriers and vendors are at keeping the OS itself up to date, so Google detached most of their services from Android directly.