The loss of Latitude was really the last time I used a non-Gmail Google service on my Gmail account.
I did a data export/archive thing first, looked at what would get deleted with it... and it was all of these posts from years ago. Things from Google Buzz, a couple of silly videos on YouTube, etc. Nothing of value.
The world hasn't seem to end, my phone and everything I use still works. Apparently you don't need a G+ profile.
I've done that a few months ago to keep Picasa Web and not have my photos migrate to Google +. So far so good, and I use Google for GMail & GCal.
I've done that a few months ago to keep Picasa Web and not have my photos migrate to Google +. So far so good, and I use Google for GMail & GCal.