I think Google Education need to have a presentation of what exactly is changing and what will be affected.
As of now, if we turn off Google Photos, the data remains and users are not able to delete their photos.
If we change the user to a Gmail only user, the question is will the data in Google Photos remain, but they cannot access it anymore? Is it the same with Drive data, Calendar data, etc. etc.
I think having a presentation where Google EDU admins can ask specific questions during the presentation would be beneficial for questions like this.
As far as automating/provisioning new users with the licenses, that is probably the least troublesome of the topics that people have questions for at least from my perspective