Close the loophole allowing gun shows to sell to any howdy doody, yes. What about yard sales? What about giving a firearm as a present? Why can't you resell something you bought?
Being able to buy 50K rounds of ammo online anytime. That may be a lot but what number would you put the limit at? My son and I can burn up a 1000 rounds in a day at the range. If you can get a good deal on buying something that you use, wouldn't you grab it up?