Hi 'Socrates'. Thank you for giving your opinion so freely!
Of course you are right, the Netherlands is a country so small and with such a large population, it doesn't have the possibilities of (f.e.) the United States or Australia. You compare it to the city of New York. I think that is exaggerated, but in some ways ... Better compare it to other large cities, maybe San Francisco, or Ontario (Canada). Also in such large cities permaculture exists! It's a challenge, but it isn't impossible!
When someone thinks of the Netherlands, mostly he thinks of Amsterdam or Rotterdam. Those are crowded, but also there are permaculture initiatives. And then, the Netherlands as a whole are larger than only Holland (the crowded western part). In the eastern and southern regions permaculture is growing. There are 'urban' projects, like in Nijmegen and Groningen, and there are farmers doing the transition to permaculture in the provinces of Friesland and Noord-Brabant (and more I think).
Changes here always come later (and on a smaller scale) than in the USA. But you can't say it's impossible here. B.t.w. you mentioned the Sahara ... don't you know the project 'greening the desert'? For permaculture nothing is impossible.