What's the threat of Uber going away? What's the moat? Wouldn't another company simply fill the vacuum? That is, unless Uber's whole venture is unprofitable.
So the end result of AB5 is that Uber and Lift will exit California or become traditional taxi companies there. Either way California taxi state will go back to where it was before Uber and Lyft entered the market.
This already sort of happened in Austin. Uber left, then a few years later it came back. When it did, everyone went back to Uber and a lot of the competitors flopped.