To be honest, the new female hasn't replaced anyone. People have been stressing this whole ordeal the wrong way with the new female. She is just one character, one little extra to the game. Not to mention, Kris was never part of Gold and Silver, only Crystal. So, therefore Kris has a right not to come back to these remakes as it isn't a Crystal remake, but a Gold and Silver remake, which never included Kris in the first place.
So, if I were those who didn't like the new female protagonist, I wouldn't complain anymore as it won't change the fact that Kris is not included and that a new girl was implemented into the GSDS remakes. If you really want the nostalgic feel and go back to the way the originals were, then I suggest playing as Gold. If you want to see Kris again and be her, then I suggest you dig out your old Crystal version and play that for now. However, the new female is who she is and has not really replaced anyone seeing as no female was ever in Gold nor Silver.