I understand all the people who want Mauer to be remain at catcher, since his skill as a catcher are a great asset. I understand people who don't think the other Twins catchers are good gambles to play regularly. But it has been 4 full years since Mauer has caught even half of the Twins games. Whether it's concussion, bilateral leg weakness, or something else, he hasn't been even close to a full time catcher for 4 years. How do you plan for a guy to be your main catcher in year 5 when he hasn't done it for 4 years? No team would do that. I don't see it, and that's without acknowledging that his concussion issue is more likely to come back if he's catching.
So, at the least, I think the Twins need to have a plan for someone else to catch a ton. If the other guys on the roster aren't good enough to do that, they need to upgrade regardless. It's hard to upgrade catching, especially for a part-time catcher. If you are going to sign a catcher, you are either going to get another flawed guy who is an ok backup, or you are going to get a full-time catcher. You can't really do either if you want Mauer to catch, as there's not playing time to justify it.
You can, then, though, upgrade at first base or DH. Except there isn't a free agent first baseman/DH who is as good of a hitter as Mauer is. I can't find one, and it's not really closer, and that's without any increase in performance from him not catching. And you aren't going to trade for a first baseman that is a better hitter than Mauer. So the best possible first baseman for the Twins next year is Mauer....the hit at catcher is up for debate, but the pure performance at first base isn't.
If you want Mauer to catch, but you can't count on him catching because he hasn't done it for 4 years, you need to keep a position open for him at DH or first base a lot. Which means you can only upgrade at 1b/DH with lesser or part time player(s), so you're not really bringing in much talent there. Just the same as with catcher...you're frozen out from making any splash bigger than a ripple.
The choice comes down to either: Move Mauer to 1b, knowing that's an upgrade, and then try to upgrade at catcher, or keep Mauer as catcher and be stuck bringing in lesser, probably part time player(s). Or just stand pat and punt completely.
I don't want to punt. I don't want the sign some fringy guys and hope everything works out well. I want them to actually have a plan and make a move based on something that they can control. That means moving Mauer to first base (or at least away from catcher), and then upgrading as best they can in the other openings.