Shattering Limits
Serialization blows the lid off of session limits! Keeping with the current 30 per session paradigm, a director could invite 29 sub-directors to rehearse. Each sub-director could then invite an additional 29 participants. If all directors engage the Director-Can-Participate feature, we then have a 30 x 29 + 1 configuration: a potential 871 person session.
Now, getting 871 on a session gets us back to the challenge discussed earlier: each computer would need to be really great to achieve the 30/grouping standard. But how often do you really need to put together a 871 person remote ensemble? The real breakthrough here is that it is now much more practical to get typical large ensembles of 50-80, and you can do so with a group of more modest computers. Each director still needs good multi-core machine, but they no longer need to be top-of-the-line. Just take a thoughtful approach to the way the director/participant ratios are distributed, and you can gather big remote ensembles for real-time remote rehearsals without too much effort.
Another side-benefit: each sub-director hears all the participants in his/her sub-session in real time, so there's more of an instantaneous live experience. You might consider dividing into sectionals where, for instance, the altos or the brass are all part of the same sub-branch. The sub-directors hear the section in real time. The director hears everything. And with our recording capabilities, everyone can hear and rehearse with everyone else, after the first take is captured and shared back to the full group.