Entertainment is its own artform...it is art. Not everyone is going to like what it is created. People will either love it, hate it, or fall somewhere inbetween. It's the nature of being an artist, whether you are a performer, technician, or a creative. You can't please everyone, and this ok.
The key to what Disneyland entertainment is trying to do, or what they tried to do with the 50th, was to create varied offerings for different areas of the resort. Walt Disney's Parade of Dreams was more classical/tradiitional in approach, Block Party Bash was more upbeat, "street party" style (which Disney has done before many, many years ago), and so on.
I am definitely looking forward to the new parade...a new parade- who can complain about that. With the trend Disney takes stateside in creating and updating live entertainment in the parks, we should be ever so grateful and thankful that we are even getting a new parade and so soon too!
Just as a note- "WDI Entertainment" as you called it is actually a division called "Disney Creative Entertainment" which is the arm of WDI that creates all the major, large scale parades, stage shows, and spectaculars for Disney Parks & Resorts and regional entertainment venues.
Each resort also has its own local entertainment department that works in conjunction with DCE.
From what I was told this new Pixar parade is being primarily done by the folks within the Disneyland Entertainment department, and not spearheaded by DCE.
Also, the rumor of moving Parade of Dreams to Florida's MK has not been approved and is not likely to happen, from what I have been told.
Again, it's Disney, you get different answers depending on who you speak with.
*My guess is that Parade of Dreams would be considered for Hong Kong Disneyland, simply because that park is modeled so closely off of our original in Anaheim, and the overall operational and creative aspects would be more similar between these two parks.