Until there is a vaccine, yes. There should be no opening of theaters, amusement parks or any places that are based on large gatherings. You assume I think schools should be opened in the fall. I don't unless there is already a vaccine. I simply said that a school was a lower risk than an amusement park but it is still a risk that would result in an increase in the virus. Which is not warranted given the inability to treat anyone with the virus even exists. Remember even if you magically had enough ICU beds for everyone in the country and enough doctors and nurse to treat everyone you would still be seeing people die from it. It kills regardless of whether you get medical treatment or not.
I disagree. If you can't open theatres or amusement parks then you can't allow people on airplanes either. You are also assuming that no treatment will help. Hopefully something that they are trying with existing drugs/treatments will work to at least lessen the length and/or severity.
As more people become infected, more people also become immune. Until the serology test is available, we don't know how many people have already had COVID-19 and are immune for some period of time.
Nobody knows if any of the vaccines currently in development will be effective. Hopefully they are but if they aren't it could be 2 years or more for a vaccine. You can't close all of these segments of the economy for 2 years or more.
Finally, on "large gatherings" in general with respect to this virus, there needs to be research and analysis done to categorize different "large gatherings." 200 people in a night club is likely to be a far bigger risk of spread than 80,000 people in a football stadium. In a nightclub, one infected person can be in prolonged, close contact with a huge percentage of the other people there due to the dance floor and socializing. In a football stadium, they are only in prolonged close contact with the handful of people seated around them. A theatre is similar. There's not really much difference between a stadium/theatre and a table game at a casino.
The virus doesn't spread like a game of telephone where it goes to the person next to the infected person and then repeats around the stadium. It needs time to infect "patient 1" before they are contagious. I don't know how long that takes but it is certainly longer than the length of a movie or sporting event.
I have seen reports of many cases of COVID-19 linked to a single nightclub or party. I haven't seen reports of any outbreaks linked to a movie theatre or sports stadium.