Depends on what you mean by realistic. All of the examples I gave were things that have happened, or could plausibly happen.

Police Raids: http://www.wired.com/threatlevel/2009/04/data-centers-ra/ http://www.theregister.co.uk/2011/06/22/fbi_data_centre_raid...

Shutdown Registrars: http://domainnamewire.com/2009/10/12/directnic-picks-up-red-... http://blog.domaintools.com/2007/03/registerfly-terminated-b...

You can never know what the company executives or managers might be getting up to, so -- as basic risk management -- you should prepare for catastrophic events.