Copied from Forbes
Many, many aircraft manufacturing experts, airline executives, industry consultants, airport planners, travel marketing and planning executives, tourism promoters and chamber of commerce-type officials around the globe, and yes, a whole bunch of reporters and pundits did, in fact, advise Airbus leaders in the 1990s not to do it as they were considering whether to build a mega-jet even bigger than Boeing’s 747
Just google “why did the A380 fail”