There are a lot of assumptions there.
First of all, I am sure that is part of something much larger and it is a real neighborhood, not something hypothetical.
Second, I don’t see people giving up their car brains just because you put a tram. I myself would still be using a car if it wasn’t made completely superfluous and fatiguing where I live and work.
That was not the assumption. Also, that map is either 20something years too early or too late to be proof of much of what was going on in the 1950s.