I agree with all that, but keep in mind one thing -
To correctly sample a choir you are not doing just another instrument. That is what all the lame choir libraries that already exist have done and why they are so painful to use.
In fact, you are doing another entire orchestra of sounds. So a properly sampled choir will essentially be VSL 2.0. With difficulties like legato on all vowels in multiple velocities in all of the four vocal groups, etc. etc. etc. Not to mention the little problem of singing consonants for complete words thrown into that mix. So this would probably be the biggest and most complex single release of all their samples beside the entire Cube taken together. To do this correctly obviously involves some innovation that no one else has come up with. Though based upon the past work they have done VSL is definitely up to the challenge.