The AE plugin architecture is showing it's age. And I'm unsure how the licensing works. If Adobe needs to approve, I doubt they would considering their purchase of Speedgrade.
I think as users and from BMDs perspective it would be good to adopt the OpenFX plugin architecture.
http://openfx.sourceforge.net/
http://www.toolfarm.com/products/category/3313/all
There is already a ton of ofx plugs available, and the api is open so anyone can develop them.
I miss the colorFX room from Apple Color/Final Touch, allow for some very robust looks.
I'd love a plugin to add realistic grain in Resolve.