To be clear, I'm against this because I don't want to see a cleavage in the community between "old" 5e and "new" 5e. I want the 2024 PHB to simply be "more" 5e, and the best way to do that is to present a book that isn't simply a redux of concepts we already have.
I want tables where players mix-and match old material, new material, and third-party material to be the norm. Tables where people say "New books only, everything from before the new PHB isn't allowed" should hopefully be rare. WotC can heavily influence the way that transition goes with the choices they make in presenting new material.