I'm clearly one of the "junior members" Steve knew would chime in (scream?) and I'm completely ambivalent as to whether this actually comes to pass. I think most who frequent this forum can easily recognize which members are pros (as well as those who are helpful) just based on the content of their posts. I already have a lot of respect for guys like Steve and many others here who are incredible resources for the community, and I don't think a few medallions or logos beneath their names would change that for better or worse.
It does seem like it would require a significant effort on the part of the administrator to vet everyone's credentials and keep track of them.