Listen they did: Even the haughty, dictatorial, tone deaf Obama administration and the ATF had to listen to the NRA, 52 Senators, 238 Representatives, 80,000 commentators, and a large swath of angry gun owners.
It should be noted that the ATF only promised to withhold the regulation in order to "further study" the proposed ban. Leaving it a possibility - certainty - that the ban will be reintroduced sometime in the future. Probably when the public's attention is elsewhere, in the dark of night, with sleight of hand... Remember, the Obama administration has another 22 months to work its phone and pen mischief.
As Thomas Jefferson said; "The price of Freedom is eternally watching those sonsabitches like a hawk."