How you feel as an individual is on you, but a lot of people grew attached to Papa Nier. I personally feel he fit the story very well, I enjoyed the relationship of Father/Daughter more than what I feel a Brother/Sister relationship would, and Jamieson Price did an excellent performance of the script. For a lot of people in the West the appeal of a Nier remake would include replicating (PUN INTENDED) the Gestalt build, given that's what they're most familiar with and resonate most with as an experience.
I hope Square-Enix is planning to fund both. Because honestly, I think having both options in the game, Father/Daughter or Brother/Sister, also gives Nier a unique if inconsequential basis. Why not?