Even then, that'd boost it to 36m or so (assuming a 40% Friday drop and Sat increase). However, WW is going to depend on if it's really going to be dad's movie choice or not.
San Andreas, JW and MoS were all male-centric tentpoles. WW was split about 50/50 on OW, however the female demo increases later into the movie's run, so leaning female centric. Staying flat is the optimistic but possible, I'd probably go with a minimal drop though.