Allenjp, you make a good point. If you're down you have to know how to handle yourself there. Absolutely. But submission wrestling is only one of the effective forms of groundfighting. Some of the RBSD, police defensive tactics and even martial arts have ways of dealing with the situation that stress different aspects of conflict on the ground. Some of them are remarkably mobile on the floor. Others stress protecting and deploying weapons. And a few of them have very good methods for disengaging and getting back up.
It's not always easy, but they have a good enough real-world track record that they can not be completely discounted. A lot depends on what the other guys are trying to do to you. In my painful experience it includes things like standing there and trying to kick you to death as often as not. I haven't met too many who tried for a submission. That may just be luck on my part. But I can only go on what I've experienced and what people with more interesting lives report.
It's not always easy, but they have a good enough real-world track record that they can not be completely discounted. A lot depends on what the other guys are trying to do to you. In my painful experience it includes things like standing there and trying to kick you to death as often as not. I haven't met too many who tried for a submission. That may just be luck on my part. But I can only go on what I've experienced and what people with more interesting lives report.