Spare a thought for the developers. As well as the G+ UI, the API is going to sunset as well. All those buttons, badges, signin with G+, Share to G+, etc, etc are going to fail. They will have to be removed and/or replaced.

If data doesn't come out of G+ via Google Takeout, then the only other option is to start writing code with the API. Except that the API has some major limitations that never really got addressed. Two big ones.
- No API access to Communities
- No API access to non-public data

https://developers.google.com/+/web/