Gun shows don't have anything to do with it. That's just what it's called because it sounds scary. Pretty much every guy selling guns from a table has (or needs!!!) an FFL and will conduct background checks. Sure, private sellers might bring a few guns in, but not that many.
What it really regulates is private sales of firearms.
Should you be able to sell a gun to someone without federal involvement? That's all it comes down to. Nothing more, nothing less.