It makes sense in the east coast: traveling from the seat of government in DC to the seat of finance in NYC. But does california have that dynamic?
Yes. The most obvious example of a company that's built around that corridor is Netflix: tech in the Bay Area, film production in L.A.
I would argue the east coast works much differently. The traffic patterns are not so much between NYC and DC, but most people moving in and out of dense areas. Much of the Acela is M-F commuter traffic.
The point being, it's so convienent I can decide to visit my friends for a picnic and come back the same day (yes I have done this) with no pre-planning. I have not pre-purchased a ticket in years.
I don't expect California to have trains every 5 to 10 minutes. I also expect they might fuck it up like Spain and require baggage inspection. I do expect that if they finish building it (I don't think they will) that by the time they do, Waymo and similar services will be ubiquitous and so it might actually be useful.
A number of VCs are based out of the Bay Area but actually live in LA (or did, before the Palisades Fire).
Is it though? My experience with Southwest is that its the worst airline I have ever used.
I have had great experiences with Alaska though. Always fast and efficient, and usually take off ahead of schedule