Cost, accessibility, and vehicles don’t last forever.
or going two wheels?
If you’re talking about motorcycles, they are basically death traps and many people aren’t comfortable on them. If you’re talking about bicycles, they are basically death traps and people don’t always want to exercise to get where they’re going and rural areas are by definition sparsely populated, bikes would take forever Neither of those offers options for families or bad weather.
Like it or not personal vehicles are a necessity in most of America.