A380 should have been built with 300 foot wingspan, folding to 200 feet. I see there has been talk of longer wingspan
https://www.telegraph.co.uk/travel/n...ger-wing-span/
No compromise either on aerodynamics or ability to use the ramps the 747 uses. Engines like that used by 777-300ER. Capacity for 600 passengers plus at least 50 tonnes of freight, or 150 tonnes of freight. Straight to 40,000 feet at maximum take-off weight (perhaps).
Far too late now, though. I see also there is work on reducing wing vortices, though that knowledge was maybe not available when the A380 was designed.