A timeline. They're quite comfortable with the infinite.
Again that doesn't make sense. Because if that's true, they would have already known that the Pah Wraiths
would be defeated that Sisko would do so .. so why the elaborate ruse?
Again, any being that lives outside of linear time and who can manipulate it knows - what was - what is - but more importantly what will come
under every scenario.
So why wouldn't they intercede when the Romulans break the existing timeline?