I'd love to see what the average household pays for vehicles. If you don't think that money is high on the motivational list for people, you need only look at what happened the last time gas prices were $1/gallon higher than today. In any case, I doubt car ownership will "fall off a cliff". It will be a gradual change. Many people won't trust the software, there will be a few incidents that get tons of media coverage to scare people off (no doubt funded by entrenched interests). Some people won't trust that the amount of time it takes to get a ride will be low enough, especially in more rural areas. Many people like the culture of car ownership. But at the end of the day, if it saves hundreds of dollars per month and is roughly as safe and convenient as owning a car, the value proposition will be too strong to ignore. But that's a change that will take (IMO) 15-25 years to see widespread adoption.