It's like they looked at MGSV: Ground Zeroes and said, "why don't we do that, but split the entire game into chunks that size and make them all full price!" "Brilliant!" "Brilliant!"
I mean it's a two disc game, it's probably going to be a lot longer than ground zeroes.
Predictions (Made July 2019)
LTD: PS4 - 130m, Switch - 110m, XBO - 52m 2019 : PS4 - 15m, Switch - 18.8m, XBO - 4.8m 2020: Switch - 22m (Peak Year)