From Alex Kingsbury who in his own admission has lobbied for years to ban them.
And from the article is is clearly no friend of these weapons. And in general fairly hostile to guns and attributes some... odd qualities to them.
But he is right that firearms can last a long time (pointing out that an AR now could work in 2119 easily). And he rightly points to the extremely low compliance rates whenever "assault weapons" are banned.
And even when drastically low balling the number of these guns in the country (he says 15 million) he points out that appreciably removing them from the country would be nigh impossible.
(The issue of criminal importation and manufacture isn't even mentioned...)
This does not mean he is friendly to gun rights folks or against any real gun control laws. Merely that Kingsbury is looking at the logistics and effect of such a ban.
However, he misses one thing.
A massive side (or perhaps primary) goal of an AWB is not to get rid of said guns, but to stigmatize the public usage of them. If they are reduced to being hidden safe queens then "gun culture" will greatly diminish.
Which makes subsequent bans even easier.
As a bonus with millions of now illegal (and thus more scary) guns all over the country. They make handy boogieman on the scale of Emmanuel Goldstein that can justify all sorts of confiscations and registrations.