I say it's easy to make L2 street parking ubiquitous _anywhere_, not _everywhere_ all at once.

Obviously taken in totality it's a massive undertaking, but you could say the same thing about streetlamps, or roads, or basically any ubiquitous infrastructure.

Many places have started with 1-2 spots per neighborhood, which is prudent and scalable. As demand rises they should be able to keep pace with that demand without significant technical challenges.