Don't make the mistake of making macro predictions based on a niche segment. I think generally people aren't "interested" in car ownership; they are interested in fulfilling their transportation needs as best as possible. Car ownership just happens to fulfill that the best right now.
There is the possibility of increased urbanization and improvements to self-driving car technology will make it economically feasible for car ownership to be unnecessary for most, but I highly doubt that happens within the millennial generation. Probably the next one.
Anecdote, I don't have a lot of mileage (pun unintended), but every girl I've ever dated did not have license, and neither do I, and I am 27. I live alone and bike and bus ride for the most part.
[0] http://www.latimes.com/business/autos/la-fi-hy-millennials-c...