On a positive note not the entire amount is wasted as assembly halls and factories can be used for something else like Broughton's wing assembly.
Isn't it remarkable that Boeing erred as well with their 747-8 strech and that Airbus in parallel to the A380 had developed the biggest twin RR engines could lift, the A350?
I wonder how market predictions could be so off the mark like this time? Travel grew as expected but finally midsized twins harvest the market.