drnickels comment is a 2010 restatement or manifestation of Benjamin Franklin's reservations after the Constitutional Convention
"There are several parts of this Constitution which I do not at present approve, but I am not sure I shall never approve them. ... I doubt too whether any other Convention we can obtain, may be able to make a better Constitution. ... It therefore astonishes me, Sir, to find this system approaching so near to perfection as it does; and I think it will astonish our enemies..." Benjamin Franklin
We may never fully resolve the underpinnings of the Great Compromise (Large State vs Small State Plan/Connecticut Compromise/ Great Compromise of 1787 ). However, this points out the tricky relationship between States Rights and Federal Rights. If we were to have a Federal mandate much like the Uniform Commercial Code ( UCC ) then we could accomplish a Nationwide reciprocity of Concealed Carry Permits. I'm sure that people in Indiana, Arizona, et al would have heartburn with more stringent guidelines as well as states, such as California, any States requiring Qualifying, Firearm Registration, Magazine Capacity restrictions, etc. having to relax their standards. My greatest fear would be that rather than relax some regulations while tightening others the lawmakers would take the accede to the safest course which would be to standardize the most restrictive regulations. The answer might be something that was kicked around in the late 70s / early 80s. This being a Federal Concealed Carry Permit. As I recall, what prevented this was the States did not want this Federal regulation owing to the 10th Amendment. Strangely enough, this is what is being used right now to stop the Health Care Reform Legislation. The upside, at least we have a form of Government where we can have this problem.