Main justification for Walt not wanting alcohol in his parks comes from the pre-Disneyland view of drunk carnies and rip off artists. We're now almost 60 years full of quality from Disney, Universal, Busch (heh), and more and I think it's more than due for alcohol sales in Disneyland and Magic Kingdom. Additionally in terms of adding up charges and increasing profits in a struggling division this seems like a sure fire way to increase F&B profits without much expenditure or risking devaluing the parks.