Thanks for the post. This is still an active topic in my own head which I want to make as seamless as possible.
Scenario A is that I add ACF5 compatibility for the current Add-ons. This would be a crowd pleaser but would bloat the plugins with duplicate v4 and v5 code.
Scenario B is the one already in place which is a very clear message is displayed to the updater which will either allow the DB to be upgraded to v5 (if no add-ons are active) or a button to auto roll back to ACF4.
Please let me know your thoughts or other ideas.
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