You first need to determine how widespread the problem is. Was it limited to simply one day's production using faulty supplier product or is it a design flaw. Worst thing any company can do is go global with a blanket statement "we don't know what is wrong and even if your item is wrong, but be advised there may be a problem with every unit we have retailed" Sure death in the market.
Now if they knew ahead of time, as Ford did with Pinto gas tanks, and decided to save $28 per vehicle then they should immediately halt production, importation, and deliveries until issue is fixed on all 12,000 plus G8's on the road.
And a failed shock will become very noticable to driver long before it could ever cause a wheel to fall off.