It’s still useful but the issue always was it’s expensive for what it does so that’s why it was used underground since that has value of it’s own. There is arguments that it’s actually more efficient than current systems so there is an obvious takeaway of being, why don’t we have money that doesn’t cost a lot of maintain. The answer is the scary part.
The system with cars is that you don’t distract the driver from driving, having a system that takes over driving is exactly that, so the idea of the system is flawed to begin with.