I can possibly see where a gun ownership license could be useful, but that's as far as I'd go.
Here's an example of one way that it could be done:
To get one, a person would undergo the existing (or even expanded) background check once, pay a nominal (< $10) fee, and have it valid for, say, 4 years. Renewal of a valid license could even skip the background check and be offered at a lower fee.
Anything that would currently prevent a person from purchasing a firearm would result in the license being immediately suspended or revoked if it happens after issuance. When purchasing a firearm, the dealer would only have to run the license (no information retained) to check for revocation. After this, an abbreviated version of form 4473 would be filled out and kept by the dealer, identical to current practice.
Lighter workload for the background check agencies, less hassle for dealers, and no increase in government intrusion.
It could even make it easier to prosecute for illegal possession of a firearm. If a person has a valid license in their name, even if it isn't physically in their possession, then they're good to go. No more difficult than checking to see if their driver's license is valid.
Possession without a valid license would (and should) result in severe penalties, possibly even Federal in nature.
The only thing that the Fed. Gov't. would know about a gun owner without a warranted FFL dealer records check is that a person is clear to own firearms, not how many or of what kind.
Ok... but why is is
necessary for the state who know who owns guns?
I liken it as an appeasement toward the Progressives who constantly want new gun legislation.
Appeasement never works -- they - regardless of who "threy" are -- always come back for more.
In fact, it is impossible to compromise with the anti-gun side because it is impossible for them to offer anything in return for the portion of your rights they want you to give up.
Besides, it wouldn't indicate who owns guns...
The fact that you have to get the license to buy a gun is , alone, probable cause to assume you have a gun - like a driver's license, why get one if you do not plan to drive?
Unless the state can show it MUST know who has guns, that it is
necessary for the state to have that information, there's no way to soundly argue against the claim that licensing is an infringement on the right to arms, in violation of the constitution.