JamesT73J - Who is the A380 selling to? I don't think they have had any new significant sales in two years.
If the 787 were to fail the majority of the design costs would be absorbed by outside 3rd parties. Boeing would only be out a few billion.
The only way Boeing stock is going down is if the 737NG and 777 get permanent Airworthiness Directive groundings. I seriously doubt that is going to happen.