First of all, as many people (particularly Hogan) have already said in many other threads, we're unlikely to get a socially distanced version of Broadway. Broadway will return when it's safe for people to be in a crowded room together, and by that point, people crowding at a stage door won't be a safety issue.
BUT, in the HYPOTHETICAL situation where Broadway does a full return without stage dooring, the short answer is: people should just suck it up and get used to being happy with the performance alone (I say this as someone who still occasionally goes to the stage door, though far less frequently than when I was a teenager).
As others have said, if people insist on getting autographs, they can still do fan-mail and/or pre-signed merch. And in fact, relegating it to BC/EFA sales would be a great way to boost donations, because there won't be an alternative way of getting things signed.
As for the logistic issues with "eliminating" the stage door: I'm assuming there will still be stage-door staff to shoo people away, but that won't stop people from hanging out further away. It does pose a particular issue for some shows without big stars. When it comes to shows with big stars, I'm assuming what will happen is that there will still be barricades set up like a gauntlet leading from the door to the actors' car. And that way they can make a b-line without being disturbed. Many stars already do this. But not everyone can get a car in their contract, so they'd have to walk out into the street at some point. A huge portion of actors on Broadway will be able to utilize alternate exits to sneak away, but some theatres only have 1 exit. I guess in those cases, they will have to either rely on the staff to adequately intimate people away, or they'll have to rely on people's good sense to stay away once directed to do so (Yikes! We're doomed!).
Updated On: 7/23/20 at 06:28 PM