Let me have a go:
When I was at university google had 8 employees :) ... who would have imagined then jobs like SEO/SEM Consultant, blogger, online life-coach, android indie game designer, stay-at-home person selling junk on ebay, etc, etc.
For self driving cars... how about:
- Guide (jump into the self-driving van, and I (human) will give you a personal and engaging tour of the region, parks, people, wines .... we'll do a few stops at designated restaurants and souvenir stores (where I'll get a few dollars per visitor).
- Self-driven drug / alcohol / party stuff / shopping / pet / kids / delivery
- Artist (drawing random patterns on the dusty planes with programmed cars?)
- Game host (where you offer 50 cars to some players who do some kind of AR laser tag activity while driven ... all the while trying to figure out the patterns they are driving in to win)
- Real-life marketing consultant (sell pay-per-detour, is paying for the detour worth it? Only if they used keyword X last, week and you have the right store front design, blah, blah, blah).
- Scheduling Assistant (Human helper to call your rides)
- Mobile Mechanic (fast response team to fix those helpless cars stopped on the road because a leaf covered the LIDAR)
Will the number of jobs add up? It's anybody's guess. I think the transition is going to hurt badly. But it will reach a new equilibrium eventually.