Are you new? Do you think customers wanted to lose the floppy drive with the iMac? Do you think customers wanted to lose ADB and serial for USB? Do you think customers wanted to lose the optical drive? Do you think customers wanted the butterfly keyboard or losing MagSafe and having to carry around dongles for everything in favor of USB-C? Apple doesn’t care what customers say they want, they do what they want and users adapt. I wasn’t saying that iPadOS WOULD replace MacOS only that it’s more likely than MacOS replacing iPadOS on the iPad Pro.Apple is not in the business of giving users the opposite of what they want. Mac users don't want iPadOS. They don't want a computer without a keyboard and no ports. And iPad users don't want macOS.
If Apple wanted to replace macOS, they wouldn't need Big Sur. The iPad Pro already exists.