I would disagree.

Backups could be maintained on a regular schedule, including full router backups. Others in charge of this could be given create and append access to the backup systems, but not delete.

Once you delineate split rights and controls, then you can mitigate the severity of these attacks. Yes, douchebag-router admin can still zero out the routers. But you can be in business in less than a day with those configs logged.