They don't want it, even if they need it. They're kicking and screaming and doing anything they can to stop it, while at the same time their city budgets are in the toilet. The only thing that's actually driving this reform is that housing prices are out of control, so you have a large demographics of people fighting to increase density.
Where this is not happening is everywhere else (think: Texas, Florida, North Carolina, Virginia, Arizona). Those areas don't have the same demand for density, but they still have the same long-term structural deficit problems.