Some of us never really wanted a new character as the main character...
I get what you are saying though as I'm sure there are fans who wanted a new character for the series (and or a reboot all together) and are now b*tching about what has been shown so far. Everyone is asking for different things, and some don't even know what they really want or like but throw suggestions and demands out there anyway. Hence why Capcom needs to focus on where they want things to go with the series instead. You can't please everyone and thus they need to do what makes them happy (other than simply doing things to make money).
That all being said, I think they were pretty close with pleasing a lot of fans with Revelations 2 and now they have completely strayed away from that game... once again trying to take a completely different route to go along with the bandwagon of people trying to achieve what P.T. established in only an hour worth of gameplay.
P.T. was groundbreaking and it is understandable why they are inspired by it, however certain features work better for P.T. because Silent Hill is a whole different horror concept with intricate storytelling.
I think a lot of people are beginning to see how the "original" characters are what make this series stand out against any other general zombie game. It is not like Left 4 Dead where they take a random group of people and throw them against the zombie apocalypse. The main series has always had something to do with characters like Chris, Jill, and Leon fighting against bioterrorism.
I'm not completely against having a new playable character, but we are 7 games deep now into the main series, so yes, I think that the main cast should be featured in this game at some point and in some way. Capcom needs to focus on what they have already established so far and make it all come together. That all said, there is still a chance that Capcom can blow us all away with this new game and tie it in nicely with the main series story arc.