Is the 787 a 2-engine plane?
Airbus made a bad bet on the traditional hub and spoke model. Boeing thought point to point routes would increase in importance and they were right. The A380 is economical on longer routes when it’s full and passengers seem to like it. Airlines even charge a premium, but it’s a limited market that’s probably reached saturation.
Airbus does have the A350 to compete with the 787, though.
Boeing analyzed the business viability of the SST back in the 60s, and decided to take a pass. The Europeans charged ahead with Concorde and operated it at a loss for decades, in order to secure bragging rights.
It was ok though because they had access to European taxpayer money.
Boeing also analyzed the long term prospects for a super jumbo, and didn’t like what it found. They decided to bet the farm on an ultra fuel efficient wide body made out of plastic.
That was the right decision too, looks like.
To me, the 380 just looks like a too-tempting target for terrorism.