Purely speculation on my part, but my gut feeling is that both Lesson Schedules and Newsletter have low adoption rates. I'm not sure what the trigger for dropping them is - perhaps it's time to update the servers or there's a change in the infrastructure that will break them and there's a question on if the effort to keep them going is worth it.
If the newsletter is dropped, I predict one side effect will be more unit web pages on places like Facebook. One of the restrictions placed on such pages is that they must have a purpose beyond duplicating tools found on lds.org. If the newsletter disappears, that just becomes a slam-dunk. (As long as you can live with the limitations.) From a top-level view, there's pros and cons to that.
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