I'm high on Shoppach and with good reason.
Next season, Shoppach will already play better defense than Varitek is now. Scouts say that he has the best arm and release point they have seen in a long time from a catcher. He also works hard with the pitching staff and has good defensive capabilites.
Granted, a rookie can't be expected to come in and immediately have rediculous offensive seasons. Next season, I see a .260/.350/.450/.800 with 15 or so homeruns. That is fantastic for a rookie catcher and is what Varitek is pretty much on pace for with the way he's playing. Eventually, Shoppach should hit .280/.375/.525/.900 with 25 homeruns when he enters his prime.
Bringing back Varitek for the sake of bringing back Varitek just seems crazy at this point. He wants too much money and that whole "mentor" thing is overrated. Shoppach will likely receive a September call-up to work with Varitek anyway and he already spent a good deal of time with him in Spring Training this season. Next season, Mirabelli can fill in the few blanks on the defensive end and Papa Jack will be there to help with his hitting.