I hope localonecrew is right, but I think it's going to be a while.
Right or wrong, the League feels the stagehands grabbed too many concessions and rules from the old-school producers over the '90's and early '00's. The new wave of young producers decided 2 years ago to take some of that back (hence, starting the $20m fund back then). They knew the stagehands would put up a fight, but they didn't know how much. Once it was clear the stagehands are standing their ground (via the ongoing strike), the main strategy that makes sense for the Producers is to use the full $20m to try to bleed the stagehands strike fund ($4m) over time to the point of having trouble making rent. It makes more sense for them to use up the whole fund and draw this out to try to get all the concessions than to go back to work now.
I'm not defending that position, but trying to explain it since the stagehands offered concessions at the negotiation and the producers didn't budge.
If the audience could do better, they'd be up here on stage and I'd be out there watching them. - Ethel Merman