Anything that holds New York City--by which one presumably means parts of Manhattan and maybe hipster areas of Brooklyn--as a minimal bar would seem to be a rather demanding standard. Very few cities in the world have that kind of density.

>Tiny villages of 20 people can be made walkable.

At some level, this is true. I suppose by some definition, the center of my rural/exurban town is walkable. There are sidewalks, the town green/library/town hall, schools, church, some number of houses, etc. Quite pleasant. But there isn't so much as a restaurant or coffeehouse or store, so while quite pleasant, it probably doesn't fall under what the typical urbanphile would call walkable.