I agree that cat centric life is awful. However "you are traffic" is not the whole picture, not all traffic is created equal. Some people are just naturally adept at making traffic.
I dunno, I have three cats, a big part of my life revolves around them, and it's pretty great.
(I know, I know...)
When there are little cars you wouldn't say that there is traffic. That's just how the language is.
Also, cars create mobility issues by injuring people.
This is how train networks the world over were built, with train companies buying up land and then developing or leasing it out after their railways made it valuable. It's how successful transit companies operate in Asia and remain profitable, building shopping malls and hotels on and around their stations.
It doesn't require population density (that comes after the development), it doesn't require government support (although it helps, especially if the government is subsidizing roads), but it does require investment and long-term planning.