Given that it's known that power users disable telemetry, developers should not rely on telemetry alone when deciding to remove a feature. The opposite is spiting power users, and you can see how that's going for Mozilla.
My feeling is that telemetry as used in most places as a gut check to ensure that what you are doing isn't a terrible idea. It isn't necessarily going to drive you to invest further into something (you generally have better ways of getting that kind of feedback).
For one, they could take comments on their bug tracker to heart instead of locking the discussion as soon as there are enough users unhappy with a change.
