Nukes have pretty much ensured via MAD that there is no future "full scale direct conflict" between major powers. No matter how narcissistic some despot might be, their overwhelming self-interest still realizes there's not much power held over an empty parking lot or when vaporized into the side of a building. It's proxy wars from here on out.

Given that, you can't think of a single scenario where having multiple floating runways would possibly benefit wartime?