I think that eventually we will get there... I believe the main reason for it is how to control and "know" which products the user has the right to use and with whlich level.
Erel has recently changed the IDE base platform, for a more versatile one... Hopefully this one will be flexible enough to achieve the Unified IDE...
This may also determine a commercial change that EREL is somewhat (understandable) hesitant in applying... B4X Budle (all 4 products sold as a single package)
This would also mean that the free B4J and B4R would be harder to get hands on, or that different packages would have to be made.
But, as I said, eventually...