"I think a lot of people would be glad to see guns disappear (as has largely happened in Australia) or at least be very strictly limited (like in the UK or in Canada)—but that’s not going to happen."

It seems to me that this sort of defeatist argument (asserting that it's impossible to change US attitudes towards guns) is just as applicable to argue that it's impossible to change US attitudes towards cars. Indeed it seems like MORE US citizens view cars as an inalienable inevitable right than consider guns that way!