It's great to hear City engineer Greg Shields say: "It's been happening as long as the bluffs have been there. It's an ongoing erosion problem that is a natural occurrence, and what you witnessed today was a normal event."
He's absolutely right, and is a good reminder that these things happen, they happen all the time, and will continue to happen. It's probably a good idea to not build a house right up next to the bluff. Give the ocean some room, because "erosion happens."