Most linguists would agree that it is logically contradictory to state that the majority of speakers pronounce a word incorrectly, because the correct pronunciation is determined by observing how people actually say a word, and not how one very special person thinks other people should pronounce it.

Isn't prescriptivism vs. descriptivism actually a very old divide among linguists?

It is a very old divide, and the descriptivists won a very long time ago. I'm sure there are prescriptivist linguists around somewhere but I haven't met them.