As a lifelong cyclist, I agree in principle. The problem is over the last seventy-five years we have rearchitected the very geographic fabric of society to make *solving* our transportation problems with bike and public transit impossible.
Before WW2, Dad would leave the apartment and walk or take a trolley to work (usually in the same city neighborhood) while Ma "kept house" -- managed cooking, clearning, childcare, and the family's community and social engagement. In the 1950s and 60s, instead of an apartment, it'd be a suburban house. Ma would drop Pa off at the kiss and ride.
Today Mom and Dad both have jobs they have to get to, usually in *different* suburban employment areas; they can locate to make the commute easy for one, but they keep changing jobs every couple of years while their long-term wealth is being put into a geographically fixed asset: their house. They are financially anchored to their house as their jobs move around the region.
Car-dependency is baked into the very fabric of society, in a way you can't fix with transportation policy or projects--not without decades of projects. But we have reached the limits of the car-dependency model; we can't fix traffic by adding marginal car capacity as has been repeatedly demonstrated by freeway projects that fail to fix traffic because we're in an equillibrium between commute times and job selection.
Transit and bike infrastructure won't fix this, but they *can* make marginal improvements in the traffic situation by taking cars off the road for the minority of people who can use these alternatives at this particular point in their lives. I think e-bikes are going to be key. I personally wouldn't consider a ten mile commute by bike on roads shared with cars a barrier to commuting by bike, but most people wouldn't attempt it. E-bikes on bike infrastructure can make a ten mile commute practical for *normal* people, and take a significant number of cars off congested roads. Public transit could help, but again in a marginal, opportunistic way. In Europe or the US Northeast where car-dependency was overlaid on existing dense urban fabrics, there's a lot of opportunity for major transit projects. But for American cities in the West which have *no* center of mass to build around, solving car-dependency is likely a Moon-shot level project.