I think his point is the names have changed but the quality is still there. 1960s Disneyland is more similar to a modern Six Flags, while modern Disneyland has no equivalent in the 60s.
This is also true of places! I was shocked to learn that the 1,100 square foot 1950s house I grew up in is at $850,000 on Redfin. But in the 1990s, my town was a boring faceless suburb near a dangerous city (DC). It didn’t have a Whole Foods, nor did it have whatever the the equivalent of Whole Foods was in the 1990s. The town itself moved dramatically upmarket in the last 30 years.
Much of Silicon Valley also fits the bill of places that were drab faceless suburbs in the 1980s when people’s parents bought houses there. But it’s not like there wasn’t expensive suburbs in the 1980s. It’s just that Mountain View today occupies the same market position Scarsdale NY or Greenwich CY occupied in the 1980s.
How the quality of Disneyland has evolved is... tricky to evaluate. The rides are almost certainly safer and probably a bit more impressive on a technical front, but the experience itself? I'm not sure and, given that I'm a middle-aged man, I have no desire to go to Disneyland ever. Still, I imagine it was a better experience in the 1960s because it was less crowded. That's not Disneyland's fault, of course. It has gone from a place where a few devoted fans went a few times in their lives to a place where a much larger number of people go only once in their life (because it's just not worth it, in terms of headache, to go more than once, especially if you don't have kids under 12).
The general problem is overpopulation--but the good news is that there's a countervailing force built in: the more people there are, the more stuff of value there can be. New York's too congested to live in? Go to Chicago. Chicago becomes full? Live in Minneapolis, or Madison, or some up-and-coming artsy small town most of us have never heard of. So, the problem we actually experience is not overpopulation itself but, rather, the weighted overpopulation that is created by extreme inequality (i.e., by some people having 1,000,000 times more votes and more choices than the rest of us). When some rich douchebag can play the high school bully and buy hotel rooms for $1000 per night (or even buy out the whole hotel) it means everyone who can't pay $1000 per night for lodging suffers. We don't actually need to depopulate the world (although, and I hate to say this, I think traumatic and unplanned depopulation is a high likelihood in the next 50 years) so much as we need to do something about the astronomical footprint of the rich; we could support the global population that exists now if only the world were run by better people and the resources better organized.
Significant percentage of Disney rides are ... identical to when they opened. They've added some new ones, and removed some, but many things remain (and are probably "stuck" now - I see no way they could remove "It's a small world" even though they keep redoing the art.