The value in BaaS is in its ability to provide mobile hackers a quick way to prototype (create an MVP) without having to think about the back-end architecture. This is quite powerful because thinking about architecture might put you down a path that slows down your team's momentum. It is definitely needed -- but not for creating an MVP and putting it infront of real customers and then taking in feedback.
Mobile is here -- it is going to stay -- it is now the standard. That said, releasing a BaaS to help accelerate team's TTM (time to market) is making a significant impact on how we (the consumer) can make better decisions on how these apps make our lives easier and how mobile app developers can make mobile user engagement easier.