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Blender wouldn’t really replace any of their existing software though. It’s not really a competitor for Houdini or Katana. Maybe Maya at some point but good luck getting the modellers and animators to switch.

Much of Pixar's software is entirely in-house. They already pay internal devs work on programs such as Presto. I'd be surprised to see them give up that sort of control.

Blender still needs to improve a lot to compete against Renderman, Octane Render, Hyperion Renderer and similar.

Blender isn't competing with those programs, because those are a different type of software. Those are renderers, not 3D production suites. And two of the renderers you listed can be natively used in Blender in place of its own renderer.

Blender is competing against Maya, not Renderman.