On delivery this will be the largest and most up to date commercial transport aircraft, with a possible service life in excess of twenty five years. Given the current and forecast state of the market it will be big enough and flexible enough to meet all the requirements for mass travel over the next two decades yet its developments costs will, by comparison to anything else able to equal it's range and payload, be minimal.
Little wonder that Boeing threw away the idea of a Giant Jumbo when they did and settled on commericially acceptable derivatives of the tried and trusted B747.