From 1921 to 1969 there were no new colleges of osteopathic medicine. When Michigan opened in 1970, it was the only the 6th overall (albeit some had opened and closed previously). Since 1969 20+ new schools have opened. No, they haven't been open as long a few others have, but what is the relevance? There is none, unless you mistakenly believe that being older is better.
I don't really get the part about the medical community gauging the quality of it's medical graduates. Do you mean that you don't think that they have been around long enough to develop a reputation? That's a kind of shallow way to look at things, don't you think? I hate to tell you this, but the reputation of your school, especially when there are less than 30 COM's to begin with, is not what makes you a good doctor. It also isn't the thing that gets an individual student into desired residencies. Hard work and determination are a lot more important. Are you really that concerend with how someone else will view you based on where you went to school?