It's a false premise, cities do not grow endlessly. If you look at other cities they're actually losing population – NYC for example.

Well the problem with SF is less density and more than half of it is single-family home neighborhoods with zero amenities.

Anti-growth people will point to neighborhoods like Glen Park, NoPa and Noe as "SF" while forgetting most of the surface area of the city is empty neighborhoods like Parkside, Mt Davidson Manor, etc.

What did you/do you use the semantic web for?

It really feels like all these concerns about semantic everything belong to a previous era of the web. I remember arguing with people 20 years ago who believed RDF and the semantic web was going to take over, but the use cases never materialized.