Hmm, your claim does not fit with what I've seen in LA. There has emerged a consensus among people who care about planning that density around transit corridor

Hmm, your claim does not fit with what I've seen in LA. There has emerged a consensus among people who care about planning that density around transit corridors is part of a solution to the housing problem. This manifested, since the early 00s, in housing construction that was mainly due to the mayor and some council-members influencing the planning department behind the scenes. But then, the YIMBY argument (which is admittedly somewhat wonky) has within the last decade taken root broadly among the electorate, and there has been a lot of such large developments built - Hollywood has been transformed. It has also manifested in the resounding defeat of Measure S (went down 31/69 %, see https://la.curbed.com/2017/3/7/14850898/live-election-results-2017-measure-s-la https://la.curbed.com/2017/3/7/14850898/live-election-result...) in LA. Of course, it's not 100% YIMBY. There are plenty of cases where neighborhoods have been transformed too fast, especially by house flippers (who are not really creating new housing), and there has been strong resistance.