I'm not concerned about any of the shows closing right now.
Yes, I agree some show's grosses are looking a bit tattered. But I think producers are well prepared for the January to March crunch and as long as their respective shows stay steady and at a decent level of profitability (and I think they will), I don't foresee any danger of major show closings in the next few months. LB, CURTAINS, and Rent are certainly in no danger. Xanadu is probably marginal, but I would still be surprised to see it close before spring. Now it's a case of being patient, sitting and waiting to see what happens, just like in any business that relies heavily on public support and their (the public's) economic burden.
Of course all of this hinges on the fact that I have been wrong before.