Earlier quoted context omitted.
You can’t built a “$2k rental”. You can only build a rental that someone will pay for. Landlords are building luxury housing because it’s the only thing that’s profitable right now due to the immensely ridiculous laws that don’t help people. But if an apartment building popped up in downtown SF charging $800/mo, it’s not like only the low income people would live there. Many people living in $3000/mo apartments also…
And which developers are going to build past the point of diminishing marginal returns?
1) Developers want to continue in their business, so they cut costs. This means factory built components, vertical integration, the same things that cut costs in every other industry. Today they have no incentive to actually compete.
2) Without zoning, any privately held land becomes available for housing, so you see completely new business models. A developer builds an entire neighborhood from scratch, for instance - this is how many of our late 1800s / early 1900s neighborhoods happened, before zoning, and they're often some of the best walkable urban centers now.
3) New entrants bring innovative solutions at scale. Modular buildings explode. People come up with shit you cannot possibly think of today.