Many developers will likely be developing at Android 16 APIs only. Will rely on Aptoide+AOSP exclusively. This is likely the timeline we'll see a decline in Play Store and Pixel usage.
Pixel market share is and always has been absolutely tiny, and the people that care about this are a rounding error.
You vastly overestimate how many people care (developers included) outside of FOSS and HN circles.
Nothing will happen, as it never does.