Sure, but Disney would make more money from a dozen different families taking 3-day trips than a single family of APers making 3-dozen 1-day trips. Infrequent visitors tend to stay in the parks longer, which means consuming more food and drinks each day, and are more likely (per day) to buy merchandise to commemorate their special trip.
Assuming each family consists of 2 adults and 2 kids, here are some rough prices:
Infrequent Visitors:
3-day park hopper tickets: $355 x2 + $335 x2 = $1,380
2 meals per person per day: $15 x2 x4 x3 = $360
2 snacks per person per day: $4 x2 x4 x3 = $96
1-2 merchandise items per person: $50 x4 = $200
Subtotal for one family: $2,036
12 family total = $24,432
AP Family:
Signature APs: $1,149 x4 = $4,596
1 meal per person per day: $15 x1 x4 x36 = $2,160
1 snack per person per day: $4 x1 x4 x36 = $576
1-2 merchandise items per person, twice a year: $50 x2 x4 = $400
AP Family total = $7,732
Yes, the AP family would spend more over the course of a year than any one of the infrequent-visitor families, but Disney would bring in more than triple the money from the infrequent visitors. And given that the parks have been filled near capacity more than ever before, the way to make money is by targeting guests who will spend more, rather than simply trying to get bodies through the turnstile.
[Note: When including things like hotels and parking, infrequent visitors become even more desirable, as they pay more per person for the amount of impact they have on the resort infrastructure]
Chapek's quote is a little confusing, as "marginally more valuable" makes it sound like the difference is small, rather than clearly saying that the "profit margins" are far better on infrequent guests. Yes, it's harder to attract infrequent visitors (especially during less desirable times of the year/days of the week, where the AP program initially proved its value), but it's worth the extra work up front to get the massive difference in spending once they arrive.
After things level out, I don't doubt there will be some sort of program to encourage repeat visits from locals to help fill in the gaps, but I hope it will have different goals than simply getting bodies in the park, as was previously the case. Perhaps this will be a paradigm shift in who DLR sees as their bread-and-butter guests; for many years, the focus has been on APs, even though it's always been the infrequent visitors who let them keep the lights on.