From Reason:

Give it time, we were told. Wait a few years and the Court would eventually clarify the doctrine. The Second Amendment is now normal constitutional law, we were assured. And so time lapsed. 2011. 2012. 2013. 2014. Nothing.
Finally, in 2015, Justices Thomas and Scalia wrote two dissents from denial of cert. They called out their colleagues out for abdicating the Second Amendment. In December 2015, I wrote in National Review, “The lower courts continue to whittle away the Supreme Court’s rulings in District of Columbia v. Heller and McDonald v. Chicago, while seven justices stand by quietly, refusing to intervene.”