There are the ones who just hate the Fairy/Light/Love suggestions, there are the ones who think a new type will just make things even more unbalanced, and then there are the ones that just hate change.
I can understand the first group, I think the second group should hold the whining until it actually happens, and the third group should burn.
For me I see adding another type as being useless more so than hating the idea. Dark and steel were added to help balance the broken meta game of gen one. Ghosts and Psychic were almost untouchable thanks to Zam and Gengar being so fast. A new type at this point would require a lot of rework seeing as how there are already 649 Pokemon. Why would their type change all of a sudden? I think it could happen but hoping it does not. For the sake of the competitive battle scene (that I am a part of).