During Industry Day at BroadwayCon, a Jujamcyn rep was on and he specifically talked about the way ticketing was done at the recent NY Pops Up event at the St. James, which was a ticketed event through SeatGeek (as everyone here knows, is their new ticketing partner).
It was 100% mobile tickets only. You could not print your ticket out. In order to access your ticket, you had to complete a COVID questionnaire - on your phone - that in turn unlocked/activated the ticket. Other platforms use similar unlocking/activating technology; Ticketmaster's mobile-only tickets (I had to do this at BAM Opera House) have a bar code that changes every few minutes - also eliminating the ability to print it out. (And eliminating the ability to forge or scalp on the street.)
While it is a fact that not everyone has/wants a smartphone, it seems pretty clear that, at least in the beginning, venues are going to require mobile tickets and if you do not have a smartphone, you're out of luck. I expect Jujamcyn and Nederlander theatres to be fully mobile tickets only. Does Telecharge's antiquated system even offer mobile tickets?
FWIW, I am also bummed about no paper tickets, as basic as they are, because I keep them as well. But, I can always make my own or come up with another solution if even asking for print-outs post show isn't possible. I feel that some shows might actually see this as a merch opportunity, though. Buy a ticket and then buy a ticket to keep!