I agree with you - I wouldn't mind seeing Sheva and Josh back either. I didn't remotely mind Sheva, and I think a lot of the backlash she gets is more on account of various issues with her AI and Capcom's choices in steering the plot than Sheva herself. She didn't do anything wrong and was intended to be perfectly capable.Oh god, no. Please. No Alice in the games. It would ruin it for me.
As for who I would like to see... I really would like a game with Sherry in, and I don't mind if Jake was in there. I would also like to see Claire and Chris team up at some point because that would give some great character interaction. Or Claire and Sherry as a team.
Personally, I wouldn't mind Sheva and Josh making a return either somehow, but I know that this is an unpopular opinion.
I don't really know who I'd really like to see in RE 7, apart from Leon and Ada. Most of the characters that fascinated me like William Birkin and the Ashford siblings are gone.