Honestly? If you're on here you're 18+. If by that time you haven't realized how important discretion can be and have chosen to post a real picture of your face, that's on you. I don't think we should ban face pics. If you are willing to post a real image of yourself on this site, then you are saying (through your actions) that as an adult, you are willing to deal with any "real world" repercussions that come as a result of you choosing that avatar. Personally, I don't think it puts the community at higher risk, which should be our number one concern, nor do I feel that it does anything to put the spice more in the public eye.
Finally, not to offend anyone, but without naming any names, there are individual(s) who have given enough information out about themselves that anyone with a reasonable intellect can piece together who they are. As these individual(s) were allowed to post that information (and may or may not be in the "public eye" ), I see no reason to prevent the posting of real face avatars when they are no more revealing...In fact, I would posit that they are less revealing as you can't find out anything from just a picture (unless you have some bomb-ass facial recognition algorithms and an awesome search engine) and individuals on here should be responsible enough to avoid saying, "oh, i know who that is, that's _________", in the event that they do recognize someone.
jus' my 2 pennies rattlin' around
SB