Is it possible, without any rehearsal, relying solely on sight-reading?
Are there any experiments of this kind with octets, nonets, maytbe entire orchestras?
I doubt, a full symphonic orchestra will achieve a breath-taking recording on the first attempt. Of course anybody knows its Beethoven, so it is not exactly sight-reading, but these points make it difficult:
the conductors individual interpretation
increased complexity of voice interaction
sheer area of a late-romantic orchestra make it challenge to hear soloists from remote groups