It's not hard to see find examples of the growth in demand for business apps. Just a glance at people in the subway ought to do it for you. But if you would like to see evidence you'll find it here.
The use case for business apps is entirely different to traditional business software. It is not about data entry - at all. It's about a few brief taps revealing insights that previously took days of emails and meetings to dredge up.
If you start to get your head around business apps now then you're in the early adopter stage. But not for long.