Americans would like mansions too if they were massively subsidized to the point of affordability.
If you stopped subsidising the suburbs and suburbanites were forced to pay the 5x higher property tax rates it takes to maintain infrastructure, people's preferences would change.
The people who currently live there have chosen where they live based on their budget. They likely cannot afford the 5x in taxes, so the practical result is that infrastructure would be left to crumble. This is what is currently happening with a lot of post-war infrastructure in the US right now.
No, the practical result in the US is a huge Federal bailout every few decades, labelled "Infrastructure."
Not to mention that they are subsidised within their own municipalities by commercial property and what little climate friendly housing is not NIMBY'd, typically by loud car sewers.
If you stopped subsidising the suburbs and suburbanites were forced to pay the 5x higher property tax rates it takes to maintain infrastructure, people's preferences would change.