hi! not discouraging more contributions on the origins and eventual disuse of long s, but you can get started on a few earlier posts..
What is the cause of some words using an 'f' in place of where we would use an 's' today (such as fuftained/sustained) in this document?
Primary sources from England often use the letter "f" in words that today we would use "s". Did they pronounce the "f"-i.e. increased would actually be pronounced increafed- in speech, or was it just different spelling?
Why is it that, in English language printed writing from the 18th to the early 19th centuries, do some "S's" look different, like a lowercase "f" without the cross?
Why did 'f's and 's's look so much alike and when did they start looking different?
When did the long 's' begin to go out of ſtyle? Were there any particular reasons for this?