I don’t think traditional dining will ever return. It worked perfectly in the old days of cruising when the only option for dinner was the main dining room. With the many options available today, from specialty restaurants, the buffet, room service etc, it makes it much more difficult to keep tables of random strangers filled at the same time for every night of a cruise.
Pre-COVID, a pet peeve of even those who love traditional dining had been that they were left sitting alone at a table full of empty seats when their table mates choose another option for dinner.