I don't see it as a question of one step at a time. He gave the SCOTUS a way out and opened the door for them to boot. Not just concerning machine guns, but towards leaving the determination of reasonable restriction on the table.
Fear? Fear the government that fears your guns.
" The world is a very dangerous place, not because of those who do evil, but because of those who do nothing about them." - Albert Einstein, 1879-1955