I guess I'm the only one who feels this way but I'll go ahead and say it. I'm glad that Pleasure Island is no more. The Disney brand represents something very specific and to me, anything that falls outside those values should be kept out of the World.
Go ahead, gut me.
It's an understandable position, but you might feel that way because you're too young to remember a time when Disney wasn't only princesses and pirates ... character meals and movie tie-ins. There was a time (not too long ago) where many areas of the WDW Resort were marketed and focused for adults - and these areas were not unpopular (Pleasure Island, golf courses, World Showcase eateries, many areas of the Contemporary Hotel, etc). They may not have had the same profit margins of other areas of the resort (like the Magic Kingdom), but they were not unsuccessful. Pre-1994, Disney went after a much broader demographic.
To put it another way, sometimes adults just want to be away from kids. Disney used to understand this and provide some limited options for people who feel this way so they could still enjoy the resort, yet occasionally escape the commotion that children create.