As long as the forgotten realms are treated as the default setting for material, then they also need to be a space for everyone around the world to whom the space is pitched at as the primary default space. In terms of the material plane, that means that they need to do a lot of work fleshing out the non-western-styled nations and continents; they exist (and have for a long time), but haven't received much, if any, love in many years, and that needs work. In terms of the divine and fiendish realms, that means that fantastical pantheons can and should draw their inspiration style and flavours from more places than just predominately western-centric sources.
The first caveat is important; I'm not necessarily disagreeing - If they stick to their orignal design intenions of being completely setting agnostic in their core book, and then publish an actual FR campaign setting book independently instead, that's different... but increasingly that seems not to be their intention.
Now I'm definitely not a fan of many of the most recent moves that Wizards has been making with their source material - but expanding the upper and lower planes to draw their inspirations and styles from more sources, and more than just western-centric sources, is not one of those places; that one is definitely a good thing. It's not taking away anything - it's only adding.
