Hm ... no good news.
Are there really upgrade paths to synchronized series? Did I miss the synchronized orchestral libs or do the actually not exist? The other packages don't fit well with the VI packages. So there are large upgrade prices because we have to buy additional instruments, that we don't need. E.g. synchronied Solo strings includes solo violin2, ...
And by the way: The Synchron player is a great product but I still prefer vienna instruments pro. One example is the time stretching. Works fantastic with instruments pro. With synchron player it was unusable because tooo slow the last time I tried to use it. Many other reasons why instruments pro is my first choice.
My summary: Lose/Lose situation. VSL loses. Customers lose too.