Protect user profile images to be restricted to users of an enrolled course

Its not currently possible to restrict user profile images to only be accessible to users of the same course.

If I'm Shakira, and attending UCLA, and am forced to upload a picture for a class, I don't necessarily want the entire university checking me out.
If you wanted to leave the control site-wide, I would suggest that instead of being logged in/not logged in, a third option is available: visible to only members of the course.