It makes more sense for mass transit or perhaps self driving taxis, which can transport you from point A to B directly. It doesn't really make sense to purchase such a vehicle and still have to worry about parking it somewhere.
For folks who enjoys riding/driving, I'm sure they'd rather continue with the task themselves...
Bikes are for sure superior commuters, but safety concerns and weather constraints probably won't make it too popular. Which is good for bikers I guess. I'm sure they don't want to see more bikers sharing their lanes!