In many communities, the only dense housing that will get approved is age-restricted senior housing. Boomers really need to downsize into this kind of housing to put affordable home back on the market for young families. "Aging-in-place" is a real problem for communities that lack adequate services for a dispersed elderly population and affordable housing for working people.
More than that, age-restricted senior housing is the only way to get around parking requirements in many jurisdictions. Build an apartment complex for normies? One spot per unit. Build senior housing? One spot per five units. And no, they don't need to worry about transit either because they're old people who are going to be shuttled to bingo and back. So if/when these facilities get their switches flipped back to normie housing we'll either (A) have magically solved all transit problems through the judicious use of Bird, Uber and self-driving cars (B) have created a traffic and parking clusterfuck of epic proportions. And, of course, none of these units will be suitable for young families, yet young families will form anyway, so you'll be looking at a double-income two-car family in a studio intended for their grandmother (no cats). At least there's a space carved out near the lobby for daycare.