I guess I'm just jaded, cuz I would assume that many people conceal weapons illegally now and they aren't likely to stop doing so just because open carry becomes legal. The only behavioral change would be from the rule-following concealed carry license holders who switch to open carry under the new law. The bad guys concealing their guns won't care that the law has changed. (If anything, they just know to avoid preying on those who are open carrying, and seek out those who are not.)