As I said elsewhere

[james_davis_nicoll]

Regarding the case for Landisian colonies in the atmosphere of Venus:

Ultimately there will have to be a compelling reason to spend trillions of dollars to move off-world: a vital resource located on Venus, mass over-crowding, nuclear apocalypse.

I have to think if the problem is overcrowding, buoyancy-limited habitats floating in a toxic atmosphere kilometers above a red-hot surface is the wrong answer.