There are fair criticisms to be made, but I don't think that's one of them. WDW's #1 over-arching business strategy is to keep you in the Disney bubble at all costs (see DME, DDP, DTD/DS, etc.). Critical to that objective is keeping you busy and/or exhausted for five or six days (the "sweet spot" for the family of four that comes every couple to five years). Any park perceived to be a "half-day" park is something that inches you towards renting a car, staying off property, visiting Potterland, eating at Applebees, etc. Avatar and the looming DHS expansion can really be viewed as one massive half-day-to-full-day conversion project.