I think you're over analyzing the situation. Where the spokes tend to break isn't from hitting the potholes. It's from inadequite tension working at the spokes to detension them on every revolution. Bend a piece of metal a few times and it's fine and still strong. Bend it the same way a few times per second and it doesn't take long to build up enough fatigue to make it fracture and snap. Your pothole worry is one of the "a few times" scenarios whereas the loose spokes are the "few times per second" example. There's also no lack of 200lb+ riders that are hammering their wheels doing big drops on trails and urban settings and the wheels last a decently long time when built properly. I doubt if your potholes add up to that same sort of punishment. And don't underestimate the cushioning effect of the tire and air pressure. If the tube doesn't pinch flat from the pothole strike then the rim and spokes did not receive a seriously crushing blow to a single spot. The tire and air pressure spreads out the impact over at least a few spokes in that area.