The Syncron Stage is a huge investment and there is a basic purpose with it to combine live instrument recordings of any size ensemble (normally dictated by a film's budget) with samples. So it makes sense to record new samples, different from the silent stage approach, that would naturally have the reverb within that stage, rather than have the reverb inserted artificially (though with a very good artificiality) with MIR. So the ideal approach for Synchron then becomes the impetus for a new sample library. But rather than reproduce exactly the previous library, VSL has decided to go much further - somewhat like the Vienna Imperial is exponentially more complex and detailed than the Bosendorfer which is still a great piano sound - and produce a new, exponentially more detailed set of samples. Otherwise they would be repeating themselves.
I am just spouting off now, because my new computer is not yet fully operational and I have too much time on my hands, but never mind that.
I think that it will be essential for VSL to develop some totally transparent bridge between the old samples and the Synchron, because there is no way they will be able to reproduce all the previous instruments - especially the later masterpiece samples like Bass Flute, Flugelhorn, Cornet, 2nd Bassoon, 2nd clarinet, etc. (Not to mention many others.) And since Dimension cannot be done practically, that is all the more reason to create a "backward" compatibility. ("Backward" being used very loosely when applied to Dimension Strings... which are truly a technological miracle.)