Depends on the city. Wouldn't work for me or almost anyone I know because almost none of us own cars. Because of social distancing this is only workable if most people own cars. And you wouldn't be able to easily hang out with your friends anyway; you'd only be in the same car as whoever you already live with, at which point just watching from the couch, with the comforts of your own bathroom and refrigerator, sounds more appealing.
There's also contagion potential with the shared bathrooms and concessions at an outdoor theater type setup.
We'll see. I'm curious to see if any of these open up here in NYC. I'm guessing it's just not worth trying to do, though; the uncertainty is so high, and the payoff window is likely quite narrow.
The economy is pretty messed up right now though, and it's not a great time for new risky business ventures. And while you may be able to maintain social distancing while the venue is actually operating, how about while putting it together?
There's also contagion potential with the shared bathrooms and concessions at an outdoor theater type setup.