3. Also, Mozilla is closing down Persona in November 30th, how will this affect the use of Mozilla Backpack with Moodle?
The use of Persona has had a couple of weeks reprieve - due for shutdown 15 December now.
Backpack is not going away, just the ID side of things therefore, other than people having to set a new password for their backpack things should just carry on as normal.
https://medium.com/openbadges/backpack-ng-update-a55f80f3dc7#.xekpmalgr