If/when mainstream self-driving eventually arrives, there's a good argument that it will provide the incentive for people to move out to more rural locations where there are many reasons to own your own vehicle.

If you live somewhere that parking's easy, there are a lot of reasons to own your own vehicle which mostly depreciates based on how many miles it's driven anyway. In addition to always having the vehicle available, you can customize it for your needs (sports, kids), use it as a sort of mobile storage locker, install a nice sound system if you're so inclined. If you don't need to drive, I'd expect more people to want a customized work/media entertainment space in their vehicle, not fewer.