There is an interesting discussion going on at the -> Yahoo sister group. The community seems to be rather split. The common denominator appears to be -> take care of the BB core functionality, or lose quite a bunch of customers ...
Video - Make Band-in-a-Box UserTracks in ProTools WITHOUT using Band-in-a-Box
With Band-in-a-Box 2014 and higher, you can use UserTracks. These are just like RealTracks, but you make your own. You can create UserTracks with Band-in-a-Box, RealBand or any DAW.
This video shows you how to use Pro Tools to make UserTracks. Make them for yourself as a songwriting tool, share or trade UserTracks with other Band-in-a-Box users or even sell them as a third-party product!