There’s one basic flawed assumption that everyone always makes when discussing this topic…
There’s nowhere in the Torah that says that the pillar of salt didn’t disintegrate immediately after Lot saw it. I don’t think it’s derech hatevah for woman-sized pillars of very brittle rock such as salt to last for thousands of years against the elements, and there’s no specific mention (that I’m aware of) that this one is the exception.
Sorry to burst everyone’s collective bubble.