The positive aspect to this, though, is that a group of pro-housing locals can make a huge difference in the conversation and see real progress. It is really meaningful and fulfilling to see housing built that you helped advocate for.
as long as you ignore their perspective, you will get pushback.
My objections are different from most. We need to re-wild as much as we can of lawns. We need to construct more wildlife corridors so carnivores like coyotes and foxes can come into suburban and urban spaces to feast on the mice and rats. we need to drop nighttime lighting down to much lower levels so that nocturnal creatures have a play second live and reproduce.
Cities evolve and change, and if you prevent the physical form from changing, they still change. The composition of people changes radically, over time, as the wealthy are still able to move in, and the working class is pushed out.
Ideally, cities would change a little bit, everywhere, gradually, but we've prevented that from happening with zoning in so many places in the US that it has screwed so much up...
The walkable city implementation should be the result of the demolition of an urban space and reconstructed in the vision of the 15 minute city. I take this view because I live in an old mill town in Massachusetts. Because of house hunting in the area, I would say a good half or more of the housing in town is really crap tenements with a thin layer of vinyl siding on it to make it look better. there is nothing you can do with these properties to make them energy-efficient or nice to live in without totally gutting the property down to including the exterior and roof. The area around these houses is not very livable as it's usually asphalt..everywhere. Not a spot of lawn or trees to be found.
instead of building over green fields, the city should use these Brownfield properties as a land for the 15 minute village. yes, this would push people out of the existing houses so prior to that demolition, they should be construction of social housing like they have in Helsinki to make room for the people displaced.
rebuild cities livable as defined NIMBYs and then you might find greater acceptance of what you propose to change.