Overtourism of big destinations is not likely to end altogether, but the validity of their worth is premised on broader cultural narratives about what to venerate, what to be seen upholding, and that's bound to change as society does. In the past tourism served a purpose of exporting ideas about how to live: ideas about food, fashion, lifestyle could only truly be experienced by being there. Unusual merchandise could only be found where there was a center of trade. But as we live online more, exchange more of our goods by mail, a global city is, in effect, always with us, independent of the built infrastructure. And we hit a forcing function for moving in that direction by shutting down so much of the physical economy.
A park is on the affordable side compared to overseas travel, or plane travel in general, for many households.