You're talking about people who have already paid 10k+ to Disney and are locked in... someone is going to be buying a park ticket or AP regardless.
Not necessarily some DVC people are simply using Disney hotels for a base and enjoying the greater Orlando area I suspect this is one of the reasons for the resort/parking fee - which Disney WILL try to saddle DVC members with
Remember it's pretty easy for Disney to determine how many DVC members are staying on property who DO NOT have admission media
But why do they want short stays? Do you suppose their data has shown greater daily spending on shorter stays? Historically a longer stay resulted in lower per day ticket prices. When you are locked in you have to buy your food and such from them too. but maybe you'd rather have two 4 day stays by two different families than one 8 day stay.
I think they want to reward short stays to get many more price-sensitive, but ultimately high margin customers, that may have higher spending per guest due to buying more merch as they may not be coming back often(and are also less savvy so less likely to "utilize resources" such as rides, attractions, shows, and discounts/loopholes).
What perplexed me for a while is why are they punishing loyal repeat guests that come every year for longer stays by raising those ticket prices?
Then it dawned on me by looking at the AP-ticket differentials: they want you to buy annual passes instead. Especially if you are DVC. They still make "economic rent" by enticing a DVC family to buy an AP to get a lower annual renewal price going forward than a 7 day parkhopper because these families likely have kids that otherwise would have been paying a lower ticket price. Plus, the discounts, Memory maker, free parking, other AP perks, etc really only apply to the first AP bought, so you can't really factor that in as a reason to buy the more (initially) expensively priced additional AP. That's more money in their pocket up front as well.
Furthermore, if annual ticket increases continue in this way (i.e. annual increase in 5,6,7 day PH pass >> annual increase in AP prices), pretty soon the AP is going to look like a good deal, ESPECIALLY if you are DVC. So, to the family who maybe likes to stay 5-7 days a year, possibly on property, maybe is already on the fence about DVC but not sure if it's worth the initial investment, this might be another incentive to take the plunge and buy DVC. And since all those nice DVC perks only apply now if you buy direct from Disney, it makes you more willing to swallow the $180 or whatever it is now per point prices they command. And you know that nothing is more high margin for WDW than DVC, that's why Spirit likes to call WDW the Timeshare Kingdom of the World.
Another benefit to them is it shifts people away from the busiest seasons as well, so maybe new DVCers will think twice about coming at Christmas or Easter.
I mean, I get it, they are greedy too, but at some point they have to realize that by turning off the more loyal repeat customer by pricing them out is a bad growth strategy, as those families' kids will not have the same attachment to the brand and WDW that I suspect most of us here have. Then where will their future pixie dusters come from?