IMHO replacing both hulls is an extreme measure and I doubt many dealers would have gone along with that.
I also don't see why once professionally repaired it wouldn't hold up for many more years.
If I paid the money the dealers are asking for the new F18's I would want new hulls too (if I bought the boat new). You even say" you don't see why once professionally repaired it wouldn't hold up for many more years" that means you have doubt about how long it will last.
