... Digital Audio Workstation?...
If you think about it, VE PRO is the mixer, Vienna Suite is the effects bank, MIR is the space/IR controller, VI PRO is the player, and of course VSL is the monumental instruments-bank.
All that's missing is the sequencer ('Arrange' and 'Piano Roll' pages) with the necessary automation tools etc. Is it really that much missing? It seems like a natural convergence to me...
A dedicated to Symphonic Music (for once!) D.A.W. built from the ground up for such a use, with tailor-made and "musical" presets, expression maps, automation/humanization tools, most importantly, some ingenious integration between notation and MIDI, in short, the works! And you're so very close with all the software you've been producing for the last few years. Plus, most of it is also a host for other companies' audio products already...
Did I mention it should be on the Mac platform first? [;)]
How about it?...