The 747 and A380 are still really popular for freight, but for passenger flights they are dwindling. Simply put there are very few routes where they are viable, think long distance and high volume (Dubai -> Sydney or London -> Dubai).

Definitely. But sadly, it's over for both.

I find Concorde and the A380 to be fascinating products. Both were great technological advancements but lost huge amounts of money. Unsustainable amounts. Both were propped up by state aerospace programs, and wound up creating the world's largest aerospace company and the only serious competitor to Boeing. What a ride!