Can the MIB be destroyed?

Maybe this has been discussed already, so my apologies if it has. But as Hurley said at the end of Ab Aeterno, " We need to stop the MIB from leaving, or we all go to Hell" How come the only option is to keep him from leaving? Cant he just be eliminated all together, if there was no MIB, than there would be no need for candidates and replacements.....or the island for that matter.

Any thoughts?

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