What would be important is that it be a pure VSL system, just like MIR or Vienna Ensemble, designed specifically to use the articulations of the library in the most efficient way possible. The generic approach of other companies trying to integrate anybody's sample library is what causes all the difficulty, so VSL could solve this by making all aspects of the interface exactly suited to its own particular libraries (though possibly allowing other VSTs as with MIR Pro).
this brings up what I find most annoying about DAWs in general - how everything is generic, and as a result most of what you are looking at on a given screen (and is in your way) is not going to be used. If VSL created a system for orchestral sound with a MIDI composition module that would exclude unused audio processing tools during the composing/orchestating process and also have a heavy-duty MIR type sound environment that could then be added, it would solve the problem of wading through AUDIO menus while one is working only with MIDI. None of the other companies seem to realize that MIDI involves essentially a two-stage process - pure MIRI composition and THEN audio mixing/processing/post production.