That's what I'm thinking. It works out because z3r0s still needs a 1B-OTY, but Mauer might be a very mediocre 1B. Basically, think Billy Butler with less power. That's nothing to get excited about.
Matt Cain and Pablo Sandoval aren't great either though. Sandoval hasn't shown solid power since 2011 and he's probably closer to a .750 OPS bat than an .800 bat. For Sammy, the deal is pretty much a coin flip IMO. Given his 3B is Freese, it makes a lot of sense on his part though so I like it.
I also like that North covered his catching situation for the next 5 years. In heavy win-now mode, he managed to fill a future hole without significantly downgrading. I like North's end the best.