A Thought Experiment:
Imagine a world 30 years from now (not so far into the future) where there is no such thing as public transit in whatever city you happen to live in. How did it happen? Why? What caused public transit’s demise? Think it’s impossible? Ask Clayton County, Georgia.
Or the flip side:
Image a world 30 years from now where there is no such thing as the private automobile. Again: how did that happen? Why? What caused the demise of the car?
Both are equally plausible. And just because you want one scenario to occur over the other (or some other third option), that doesn’t guarantee that scenario will occur.