Again, I don't think we should have any sort of endorsement cap in the world factbook entry. We're entirely capable of holding onto the regional delegacy without one, it is intimidating, and it can breed complacency by the Delegate.
I would expect any "Endo Guard" to have at least 3/4 of the Delegate's endorsements, and for us to get in touch with any nation that gets close to them in endorsement count.
We can handle such nations on a case by case basis, saving ejection for those that are clearly foreign agents or generally hostile.