To be honest, I don't think I'm very interested in getting the whole collection of any instrument recorded full quality in semi-tone. I have only one Mac Pro and I don't plan to invest in a network of ultra powerful machines - not yet...
But yes, I would really welcome another extension to the Special Edition, similarly priced, that adds more articulations to all the instruments present in the Special Edition, including the runs and con sordino of the Orchestral Strings.
Let me try to draw an analogy here between VSL and Apple. Apple offers the Mac Pro, incredible machine, at a really high price. But no doubt that you pay for what you get, and you get something big! Then there is the iMac which isn't modular at all, but which is good value for money and can still do a pretty good job. Those two machines are amazing for what they are, but it won't stop people for wanting a sort of mini Mac Pro that doesn't have the specs of the elite machine (and therefore doesn't cost as much) but still gives more modularity than the iMac.
Does it make sense? Something not addressed to high end composers studios, but a bit more than the introduction package for beginners in orchestration. Because if I want to upgrade to something a bit more substantial and get the missing articulations from VSE+, I need to upgrade the strings, the woodwinds, the brass and the percussion. Ouch! Now this is (and will probably be for another few years) way above my budget!!