Sure I’m not arguing against, per se, more that it’s not enough to be worth worrying about.

Of the private golf course that are where people would want to live and where transit would be viable, that would not be better turned to more public parks and recreation, and where a locality can afford eminent domain, go for it. I’m sure there there are such projects. However I’m also convinced it would be a lot of work and expense for a vanishingly small percentage increase in housing supply.