The air volume is so great even pulling every molecule of water from the bottom couple hundred feet of air would only be a few tenths of a percent of the miles of air mass above it. The hydrological cycle means there will always be moisture in the air. From coast to coast big frontal systems can cross the whole USA in less than a week with air from the Pacific Ocean basin. Gulf of Mexico moisture makes it to the Midwest on the regular. Sahara dust goes as far as the Amazon rainforest and we get it here in Texas at certain times of the year. The atmosphere is literally a giant river system of currents moving air and water globally. So no humans would never be able to pull enough out over an air column 35,000 feet high and thousands of miles wide to ever truly effect the atmospheric water cycle
half of the water vapor in the atmosphere is found within two kilometers of the Earth’s surface. Absolute humidity is the measure of the amount of water vapor in air. It’s basically whey observation telescopes try to locate themselves on high mountains. Less vapor to occlude or fuzz images of stars.