I agree. Given its design it would have to be rethought for any theatre other than the Olivier (with its famous drum). And does AEA have the same provision for supernumeraries (extras) that British Equity has? I think there are at least a dozen in this, plus the children. Plus a speaking cast of around 25-30.
But I think if Meryl Streep were headlining it would guarantee big sales. Tracy Letts came to mind as a good Ill.