This must be so stressful for international students. I am domestic and am also wondering what will happen -- whether anyone will actually be able to start in September. It is impossible to say now, but I just want to offer re: switching online that it would be completely understandable and fair to ask for a deferment or, if impossible, to back out if this happens, given the extenuating circumatances. After all, it is fair to expect what you were promised when you accepted, even if it's not the school's fault that a pandemic erupted.