SNOW DAMAGE

A few days after a major snow event - 18 inches plus - all the snow, which included a layer of ice caused by freezing rain early in the storm, cascaded off my house at once. Several panels have been displaced by several inches, actually sliding down and now stick out. Upon inspection, a roofer discovered that at the peak of the roof, many panels are now torn, some just a quarter or half inch, while those that obviously slipped have a tear of several inches, as the sudden release of all the snow caused the pans to rip where they were fixed by fasteners below the roof ridge - the fasteners held, but the roof panels did not. Fortunately, the membrane underneath is intact and for now there is no water damage. The roofer says the entire roof now needs to be replaced. Thoughts?