I think we have to step back and ask what we want off-B non-profits to do. Do we want them to produce only work that has been proven in advance? Or do we want them to be incubators? The risk in the latter is that it means we are not taking enough risks, and when we don't, we miss out on lots.
Yes there is a balance that is a good thing: we don't want theatres to turn into fringe festivals. But when a show with this pedigree of creatives comes along, I don't think we insist it be sent to development hell. Speaking of which, we kvetch about development hell too. :-)
So getting back to my question: is 2ST's mission to guarantee the quality of what it offers to audiences? or is it to do what a non-profit can do and take a lot of risk? To me the excitement of theatre is in the high wire act. Do you really want to watch American Ninja Warrior and not see anyone get wet?