I think that all Pixar, Marvel, LucasFilm, etc. properties belong in DHS, and would make for an incredible park, but what the hell do I know?
I'm as big a fan of Toy Story as there is, but why limit yourself to one IP? Extend "Pixar Place" from where it is now into the area being developed as "Toy Story Land", and you could have an incredibly fun land, while also opening up the opportunity of moving ill fitted IP based attractions from other parks (MILF and Buzz in Tomorrowland, Nemo and Crush in Seas, etc.).
The problem with that approach is you get a poorly themed land - a hodgepodge of IPs if you will. What I like about TSL is that it is themed to be Andy's backyard, and everything in the land is centered around that theme. I'd love to see a couple of Pixar-themed lands for some of the more prominent characters (maybe a Monstropolis or a land where Supers are roaming around), but stuffing them all into one land (a la DCA's Pixar Pier) seems messy...
This is the perennial debate over whether a 'themed land' is properly themed simply by grouping IPs from a single studio. That may have been the plan at one time with Pixar Place in DHS. But, that never came about since it had only one attraction, TSMM. And now that the area is being expanded into a land, they're still keeping it to one IP, Toy Story.
The Disney parks as a whole had that same issue. The parks were mostly their own Disney IPs thrown together in one park. They tried to mitigate the mishy-mashiness of it by creating thematic lands for the IPs to live in. Fantasyland may look like a singular theme, but what does PhilharMagic have to do with IaSW or Little Mermaid or Tea Cups?
But is having tangentially related attractions a problem? It hasn't been for over 60 years.
Until Potter.
The Wizarding Worlds created a new paradigm: The land and all its attractions completely mesh around one very popular IP. It proved to be wildly popular. And so, we then got Radiator Springs, Pandora, SWLs, and TSL. From now on, this is the New Way.
Until Pixar Pier.
You want a Pixar Place that's just full of Pixar IPs regardless that the land itself has no (or very very little) theme whatsoever except... Pixarness? Or "we're on a pier!" Well, CA is getting it.
We'll see if that works.
IMO, it would work just as well as if you had a "LucasFilm Pier" filled with Star Wars and Indiana Jones attractions intermingled with each other.