I fear it may be happening already. DWF/OG posters whizzing off to 'pro-new series', 'anti-new series', 'spoiler', 'anti-OG', 'jazzy graphics', 'non-jazzy graphics' Doctor Who forums.
This has happened when another (non-Doctor Who) site I posted on closed and it was a disaster. The community disintegrated and what was left was umpteen specialist forums, often poorly moderated, intolerant of variety and either slow or dull. Hopefully we can get back to a situation with one strong and varied main site.