And hopefully Dubai Intl Airport will decline into insignificance like Gander Intl Airport did.

From Traveller.com:

The first non-stop commercial flight between Australia and the UK has touched down in London. QF9 arrived at 5.02am local time on Sunday morning after a 17-hour long-haul from Perth.

A bit of aviation history:

Construction of the airport began in 1936 and it was opened in 1938, with its first landing on January 11 of that year, by Captain Douglas Fraser flying a Fox Moth of Imperial Airways. Within a few years it had four runways and was the largest airport in the world. Its official name until 1949 was Newfoundland Airport...

Gander is near the great circle route between cities of the U.S. East Coast and London. Starting in the 1940s it was a refueling stop for transatlantic flights to Scotland, Ireland and beyond, and continued in this role through the early 1960s and in some cases into the 1990s...

With the advent of jets with longer range in the 1960s, most flights no longer needed to refuel. Gander has decreased in importance, but it remains the home of Gander Control, one of the two air traffic controls (the other being Shanwick Oceanic Control in western Ireland) which direct the high-level airways of the North Atlantic.

Dubai is the modern equivalent of Gander. Flights have to stop there to refuel and most passengers never leave the airport.

What will happen to the rental value of land in Dubai? It declines - that rental value now accrues to airports at end destinations and their hinterlands as they will be more easily accessible.