The Democrats lost their zeal for gun control in 1994. I think it would take something far different than what we've seen in the way of multiple victim shootings for gun control to gain any traction. Maybe a shooting with an AR that had been altered to full-auto, used armor-piercing ammo, had been equipped with every feature banned in the '94 bill, bought at a gun show through private transfer by someone with a history of mental issues, but who nonetheless had not been previously flagged as a prohibited person when making multiple handgun purchases, and had said mean things about Chuck Schumer on Twitter.