Er...yes. That's the reason there's anti-car rhetoric.
But you're also overstating the problem, which I wouldn't have thought was possible. Car culture is pervasive, but plenty of major American cities have decent-ish public transit.
Your whole argument is weird. It seems like you're saying "This problem is real, massive, and pervasive, therefore we need to stop trying to fix it and ignore it completely."
And, living near Seattle as I currently do, the notion that we'd need to completely rebuild everything for public transit to work at all is not accurate. Plenty of major cities have decent public transit already. There may be a few cities that are beyond saving, and it wouldn't work in small towns, but that's true anywhere; no one in rural Germany is taking the bus to work, no matter how great it is in Frankfurt.
These problems are widely known and currently, they have no solutions in sight. Most people want to keep the status quo, but even if there was a mass movement to change this situation, I doubt the money would be allocated. The money most certainly exists, but much of it is currently wasted (defense, bailouts, tax breaks for the rich, weapons, more weapons, etc.), at least at the federal level. I don't think any state currently has the budget to even begin to make a dent in car culture. Hell, we can't even replace hundred year old critical infrastructure bridges, yet anti-car people want a whole new infrastructure (either that, or they're delusionally thinking that everyone can cram into downtown somehow). Car culture is here to stay. That's what the market dictates in the US, anyway.