Maybe not, but it has the virtue of being their only chance of not running out of money in the next few years.
If Uber wants to be a player in autonomous vehicles they have to become profitable enough to survive long enough to realize that goal. Kalanick's plan was always a pipe dream. Driverless cars just aren't going to be ready in time.
Companies can raise funds if people think it'll succeed.
Uber is very different. Their burn was $991m in Q4 2016 and growing.