It's a fixable problem, long term. Bikes aren't super dependent on high density like a subway, even the relatively low density of many US suburbs can work okay

It's a fixable problem, long term. Bikes aren't super dependent on high density like a subway, even the relatively low density of many US suburbs can work okay if the infrastructure is good, and you allow POI (like shops/restaurants) within a reasonable distance. That would necessitate zoning changes, but it's easier to achieve than overall density changes. If you look at cities that DO have good infrastructure, they have relatively high bike rates even without being particularly high density, like Davis, CA, or Portland. The idea that it just can't happen in US cities is not borne out by the facts.