It seems that the "good corporation" is taking an example from Microsoft and wants to make users and manufacturers as quickly as possible switch to their own "top ten". Given that the Google Mobile Services (GMS) suite, which the company licenses for pre-installation on Android devices, is being developed in Mountain View, the company's logic is obvious.
Simply put, after January 31, 2020, non-compliant devices will not receive GMS approval. This is a package of services, applications and utilities, including Google Play.
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At the same time, updates on Android Pie will be released, tentatively, until August next year, when Android 11 appears in the release. But these will only be security patches. Thus, Google also began to "tighten the screws." What this will turn out, one can only guess.