At this link was a story about the closing of VMK. It is very interesting, that the following is mentioned (especially wild is the first sentence):

Industry executives who have talked to Disney said the company wants to relocate the loyal users of Virtual Magic Kingdom to its other online worlds before they grow bored with the theme-park game. Others speculated that Disney wasn't interested in nurturing a cyber-world that wasn't invented in Burbank. The Virtual Magic Kingdom was built, developed and maintained by Sulake Corp., best known as the creator of the two-dimensional Habbo Hotel.


From an interview with people from other 'online' companies:

Jason: VMK had to shut itself off due to unexpected success. Scrabulous is great. A couple of guys in India introduced something that ignited a lot of interest in casual gaming and it has a business model.