That won't be a problem. There are millions of Americans who are already sick to death of staying at home all the time and isolating themselves from others, and by June there will be a lot more. They will be very eager to go out again with a bang once the restrictions are eased. Crowds will probably be significantly less than usual at first because planning a trip there right now is an uncertain thing, and many people have been hurt economically, but the parks won't be empty by any means. Plenty of people have still been getting full paychecks working at home, are at low-risk from the virus, and want to return to regular life asap.
I'm not particularly young, but I feel bad for healthy young people right now (I also feel very bad for the sick, elderly & others at high risk, of course- how much more stressful for them). But as the mother of a teen, I see how young people's social lives, which are such a big part of their lives, have been curtailed. Virtual is not the same as the real thing. There has never been a time in American history in which everyone had to socially isolate at home for months, and I think it's very challenging in particular for those young people, who developmentally speaking, are at a place in their lives where they naturally want and need to socialize a lot and explore the world. It's a sad situation all around.