You'll still be able to get a $5k car. You will just have to wait an extra 10 years after the original purchaser has paid the $3k for the autonomous upgrade to get one with self driving features. Think about it - even when they become available, they will initially only be a small part of the cars sold in, say, 2020. Even if they are the majority of cars sold by 2030, there will still be lots of used non autonomous cars available at that point and beyond. Maybe by 2050 it will be hard to get anything else, but who knows what Uber will be offering as a per mile rate by then - maybe car ownership will seem quaint to some people, at least in urban areas.