Just my personal take, but there's more to Dick's repertoire than aviation. He got a lot wrong, IMHO, in that regard. But he comes across with pure common sense in respect of 'sustainability.'
Our children will rue the day when we bequeath them an overpopulated country that can't house or feed itself. As Dick rightly points out, capacity is 'finite.'
From my perspective, this is a far larger issue than those we squabble on in this forum. But that doesn't mean I'll stop squabbling!
Dick's point could be described as 'mega-strategic.' It's an issue that will decide the quality of life that our descendants inherit. Unfettered growth is a dangerous chimera and Dick is about the only one warning of the consequences.
Just keep him away from the aviation portfolio!