That's movies getting moved back, not theaters saying they'll be closed in July. Movies can be pushed off and possibly do just as well as they would have otherwise. Opening them sooner is a bigger risk. There's also the fact that the movies being pushed back now need to be put somewhere, and the movies coming out in summer are on hold because they can't finish production and reshoots.
Theme parks can't just push back re-opening and recoup the money. Every day they are closed they lose money.
While theaters themselves are in a similar situation, the people moving the movies back are moving things back without any real consideration of the theaters.