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As a data point, what we did in the Clojurians Slack was make the primary channel (which no one can opt out of) an #admin-announcements channel and disable posts to it (except by owners/admins) and then created an #announcements channel which folks were auto-joined to but could opt-out of. Of the 11,650 members, about 4,500 have stayed in #announcements since we did that.

this is exactly what a company I worked for did with their slack instance - <#C0922A726|> was renamed to `#announce-global`, posts to it were restricted, and people would opt-in to local announcements by joining the `#announce-{office}` channel that was relevant to them