Earlier quoted context omitted.
> The only solution is changing the zoning laws What about pulling a HongKong / Singapore: Create a special economic zone that is a stand-alone municipality with extremely lax zoning laws to spur housing & transportation growth? Google is kinda-sorta doing this. To avoid Mountain View NIMBYism, just carve out the Google land for this purpose.
Extremely lax zoning alone isn't enough. Houston is a large city with no zoning at all, and it's still not population-dense.
It's harder to build denser if you have very little good public transit (or walk/bike infra) to speak of. Density doesn't exist in a vacuum.
I mean, Houston is the principal city of a metro area of 7 million people, and has no subway, no mass transit that's separated grade whatsoever. That's not a setup that's going to easily support higher population densities.
Meanwhile, you look at a city like Munich that's in a smaller metro area, and it has several subway lines, plus several hybrid commuter/mass transit lines that are separated-grade at least within the city proper. They're steadily building yet more, and Munich residents don't even consider their transit to be all that great! (lots of complaints about the S-Bahn, for sure)