Fortunately at this point it’s all just recommendations
I think that it would be fine if a business required anyone coming into wear a mask. Movie theaters are a place I would be happy to wear one. But they would probably be terrified of losing concession sales due to inhibiting eating.
I do expect movie theaters to cordon off every other couple of seats to create 6-feet distancing. So it’s going to be harder to get a seat for a hot movie. But I think the vast majority of movie screenings do not play to packed houses so shouldn’t be a huge economic impact.