Well sure but follow that same train of thought....if everyone is carrying openly then who do you shoot first?
Based on purely unscientific questioning of like minded folks, the majority prefer concealed. I just can't imagine people walking around openly strapped - so you would stick out like a sore thumb. Kind of one of those "Well, not enough people are doing it to provide the 'too many targets' theory of protection".
Even in states where open carry is permitted, they are struggling to get people to do so - one state (Indiana maybe?) had an "Open Carry Day" to try and get people to go around for a whole day with a visible weapon, just because they could but no one does. They were trying to destigmatize the general public to the idea - but they have not been too successful.
Again, I have no problem with either way, but my own preference is concealed. With your skills, you would be the guy I would want to be the invisible threat - while the bad guy is shooting at the pudgy wannabe weekend warrior with an openly displayed gun he has fired exactly twice since qualifying, you would be able to take care of business.
EDIT: I am going to posit this question over on the MHI FB page and see what that group of like minded folks think. Should be an interesting discussion.