Yes, all three shows took a box office hit last week and are likely to take another this week. But if you look at all the shows' grosses, every show took a drop last week even the big hits (which simply means fewer premium seats were sold). The trend right now is down and will probably remain so for a couple more weeks until tourist season kicks in. Right now there are graduations, end of the school year, weddings and other seasonal events competing for the theatre-goer's time and money.
Also we don't know what the advance sales are.
Of the three Rocky is just that, rocky, but the other two seem okay for the moment.
I would much rather worry about Mothers and Sons which probably has not broken even since it began. The gross has sagged badly into the mid-100s. If it doesn't win Sunday the run could be cut short.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher