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This is really a matter of the operations, availability and the performance level of the disaster recovery (DR) center and the ability of your staff to support ongoing operations of a remote facility. None of those aspects should be overlooked. Yet, even with the amount of time you spend at a failover operation, its potential implications are often overlooked.
Organizations should consider their DR capabilities in the context of the impact on staff and the long-term availability of the DR center. An extended outage or a far-removed facility may be impossible for you to support with your existing staff. Or, frankly, your staff just may not be available if you have a severe local disaster.
So how much can be automated to that center, in a lights-out, totally unmanaged fashion to allow failover to operate for an extended period? Also, what is the cost?