However nice the idea is, the odds of it are coming to fruition are extremely slim.
The problem remains what might be called "core competencies". Often, when a business moves away from its core competencies, it starts heading down the path of negative cash flow and bankruptcy. Does VSL even begin to have the resources to develop such a product and at the same time keep developing their sample libraries and related software?
How much would it cost to create such a product? How many more additional staff members would have to be hired? What would the estimated cost be to create the product? What would it sales price be? How many units would have to be sold to break even, let alone make a resonable return on investment? More important, what would the real market demand be? That market demand would likely have to go far beyond the VSL core community.
Granted, given the talent level at VSL, if anyone could pull it off, they could. Yet, perhaps Cubase already is in the general ballpark (don't use it, so can't really say)?
It is a lot of fun to talk about our various "wish lists". But, what have we wished for of late: new strings; better yet, all new orchestral samples for everything; a new sequencer/notation program, etc. Combined, that far outstrips VSL's current resources. Even the existing full libraries appeared spread out over a number of years. If the choice is between continuing to develp existing core products, and doing less with those core products in order to develop the new Super Sequencer/Notator, better to stay with continuing to improve the core products.
Again, it is fun to "wish" (and it really is fun). Unfortunately, the actual situation tends to put a damper on that fun.