The problem with open carry in today's climate, is if you do happen to find yourself among protestors and they see it, it could cause a confrontation
Well, protestors notwithstanding, I would consider RIOTERS to be more of a threat however I believe the question of open carry instigating more problems than concealed will be predicated by the environment.
If one is open carrying in a large, urban environment that is predisposed to more crime and violence then I suspect one MAY be in more danger open carrying. There have been verified cases of OC causing problems but there have usually been details that have exacerbated it.
Where I live (predominantly rural) I do not have a high level of violence and crime and therefore do not regard it as much of a problem. I OC regularly, as many do and it does not even raise any eyebrows.
I have never heard of anyone open carrying in the Central Oregon area where I live having a problem but most all I see carrying are doing so responsibly and unassumingly.
I think there would be more of a problem associated with the method of carry as opposed to carrying itself.
An example would be is a while back while in a local LGS I saw a tall, lanky, goofy looking fella was standing there with two revolvers in old leather holsters forward on his belt (kind of like pointing at each other) He kind of looked like a cross between someone in a spaghetti western or an old 1930's picture of someone defending his still against the revenuers.
Put this guy in a high crime environment with his method of carry (if even legal) and his chances of losing those two guns would probably be much more probable than someone open carrying unobtrusively and responsibly.