In 30 years we might have autonomous cars and buses, but we won't have autonomous aircraft. And that blimp is just ridiculous. It is designed for heavy lift, not passenger transport. It is cumbersome and slow.
One of the key features of high speed trains is the high speed part. No self-driving car will ever do that.
So, even though California is jacked up in so many ways, a high-speed train could actually work there. It won't, because California, but it could.