W3C Feature (GeoLocation) Deprecation timelines

Now that W3C have officially deprecated the GeoLocation API

How long do we have before our existing navigator.geolocation code stops working?

Is there some feature/API retirement that we can refer to as an example?

Most importantly who approved this? #GeoLocationIsNotaSensor! Sorry I take that back, MOST importantly who ask for a GeoLocation Sensor?

There is no mention of deprecation whatsoever in the page you linked to.

What this warning box says is that the specification of this API has been moved to an other working group, Geolocation Sensor.

So given they even created an entire working group for this API, I'd bet it's not going to get away of browsers' implementations any time soon, _{but future can prove me wrong...}