Co-op shouldn't be in the next Resident Evil game I mean yes it is fun at times and all but it removes all the horror bits from the game if there is someone who is next to you able to heal you when they don't even have a healer. The problem is all Capcom cares about is money just like EA so they won't remove this they will countine to force it down our throats like idiots.
Co-op has no place in a survival horror game like RE unless it's in the bonus modes like mercs. People that don't like that can go play one of the many, many co-op action games that cater to their tastes.
I believe there should be multiple campaigns again like in re 6. Leon should be alone and maybe meet up with ada for some fun down the road but people like chris should continue to be with a partner/group and make the enemies more tougher and badder.