Even after masks are no longer required, I suspect at least for the short term they will have to make changes to shows and dining to maintain social distancing.
Adding performances of shows would be an option with assigned show times and seating. I know on our cruise on the Magic one show on a sea day had a third, matinee performance at 2 pm, and the Golden Mickey's had an open seating "encore performance" at 11 pm.
They may have to add a third and maybe a fourth seating to all dining rooms to keep capacity down. Maybe an early "early seating" at 4 pm, the 6 pm traditional early seating, the traditional 830 pm late seating, and maybe a late "late seating" at 10:30 pm. We are west coasters and for us, when our kids were small, and because our bodies never really switched time zones in the 7 days, late seating at 830 pm EST (530 pm Pacific) was too early. At home the kids were rarely home from school/little league/soccer before 8 pm PST to eat dinner and rarely in bed on the ship before 1 am. Both kids were disappointed Disney didn't have a midnight buffet like the HAL cruise we went on the year before. They were hungry again about the time.