Based on the idea that you get what you incentivize, and irrespective of other factors, I'd expect a marginal to mild increase. Self-driving cars can make commutes a bit more pleasant and substantially less dangerous, but they can't reduce commute times (until they reach saturation or close to it), and time's the main limitation.
Actually, I think that there is great potential for self-driving cars to reduce congestion and thus commute time.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Duration set to six days to encourage Monday as first day.