I definitely think there's an argument that I'm overly optimistic  But increasing transit won't get suburbanites out of their cars. I think the insurance costs of non-AVs will make them less practical and as vehicle ownership declines (whether from 4 to 3 or 3 to 2 etc) people will rethink the use of their garages and driveways. 

To counter myself, it will likely result in more sprawl due to faster commute times, transit costs will lower from not needing drivers (why isn't that happening faster, especially with trains?)