Here is the promised Anki deck for "Some key numbers that (almost) every EA should know".
Due to time constraints, we were not able to include all of the numbers suggested in the original thread. These may be added in a future version. Please go to the deck's GitHub repository for details on how to be notified when new versions are released.
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My impression is that cage free campaigns have been very successful and there's much less low-hanging fruit, such that I don't think it's reasonable to extrapolate those results to an ongoing basis.
I agree that's one way in which the estimate may be misleading. The author lists this and other ways in a dedicated section. I revised the note to add a link to that section.