If I was consulting at a company and the CEO told me that they were going to wall themselves off from the rest of the world, to prevent unwanted impacts from occurring to the organization, I would pretty forcefully make the argument that what they were doing was going to increase the amount of unwanted impacts, exactly the opposite of what was hoped.
Organizations which isolate themselves in an attempt to insulate themselves will not be challenged by or have access to better ideas, processes or products from elsewhere. Ideas, processes and products that others will have access to. Are those challenges uncomfortable, pushing the organization into new and potential untried directions? Yes. But those very challenges help them to progress as an organization and it helps them progress on making better, higher quality products. Isolated organizations stagnate, as the world passes them by, making them obsolete and ripe for failure or collapse. It is only a matter of time.