To the extent that the story is covered or garners any wide attention, all such a letter will accomplish is ultimately increase sales for Cabela's, Bass Pro Shops and any other store mentioned in the letter, as well as help fundraising for groups like the NRA and Second Amendment Foundation. If the senators are very lucky, maybe their gesture might help some gun control fundraising. What it will certainly not accomplish is changing the law or altering the policies of companies with largely very vocal pro-Second Amendment customers. Heck, gun control proponents couldn't even muster a majority of Democrats in the Senate to sign the letter.
I would also note that the three day "default to proceed" was most certainly not a loophole in the law. It was intentionally and consciously included in the statute in order to ensure quick and proper due process and prevent the government from de facto denials of firearm purchases without the statutory disqualification factors.
The vast majority background checks are completed in a matter of minutes, and any issues are not usually the result of needing more time for the check, rather it's a problem of correct and updated databases and information sharing among the federal government, states, and localities. The problem of not timely processing applications and checks is also hardly theoretical, and the subject of successful lawsuits in a number of states. In any event, the law allowed discretion to firearm dealers to complete any sale, although they generally had no obligation to sell any particular individual a firearms irrespective of the law.
The senators should focus their efforts to improving and expediting the actual background check system instead of crass and transparent attempts at back-door gun control and attacks and law-abiding firearms dealers. It's no wonder why the most vociferous gun control advocates are also best firearms salesmen in the country.
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