I thought people are moving specifically because large cities are unliveable. The article actually cites a more lax regulatory and tax environment as one of the reasons for why people and businesses are moving.
https://www.usgovernmentspending.com/california_state_spendi...
You also missed the chicken/egg...high taxes a component of the high cost of living that causes people to move in the first place.
California's poverty rate has risen with the population...the poor are moving in and they are not impacted by most tax measures, so they have no reason to oppose them.
https://www.usgovernmentspending.com/spending_chart_2009_202...
Taxes are just one side of the same coin, the high cost of living is really just a density issue. Lots of high paying jobs, lots of Nimby building practices and little density and transit investment. Tokyo is a city of 20 million people yet is far more affordable and even has higher taxes.
California didn't build to support it's population. If these secondary cities make the same mistake, they too will be high cost/unlivable places.
Public Tram, Bus and Rail systems are obsolete because they need a permanent human driver (expensive, difficult to operate 24/7) or dedicated infrastructure (expensive). They cannot operate point to point or modify their route in response to demand. They cannot discriminate against who they accept (no female-only busses, or upper-class only busses, etc.)
What we should be looking at is what kind of changes to the physical road system do we need to accelerate autonomous vehicles - road/lane markings? Digital traffic signs? Inter-vehicle data transmission standards?
Autonomous private busses, with routes auto-calculated based on the start and end point that passengers enter via smartphone, will take cars off the road.
Cars off the road will speed up those busses, making them more attractive.
Etc.
Wouldn’t all the new scooter riders take up a lot of that real estate on the road?
How will the road operate with both autonomous and non-autonomous vehicles sharing space?
People escaping high costs are typically moving to a place where they will probably have few roots and connections, so there will be little reason to stick around if costs rise again