If it works in a country where the auto is so ingrained in the culture and lifestyle, it can work anywhere.
Dense cities are also the only places where public transit works, so it kind of balances out.
> This is just a small example.
New York city is a small example? New York city is the largest city in the US, and pretty much the ONLY city where you can do this. And the mediocre results (10% is very little) from even NYC show that this will not even come close to working anywhere else.
Dense cities are too congested for speeds to get that high. As an example, I felt safer biking in downtown San Francisco than I do on the country roads near me because people are constantly speeding and on their phones.