I understand this but I still don't like it. I think this is a bigger blow to the rebuilding process than most seem to think. It would've been nice to have him at a premium position in the early stages of our hopeful resurgence.
I disagree and think it's beneficial to the rebuilding. It's finalized and the Twins can start making other moves with Mauer set in one position instead of not being able to sign player X (like Abreu) to a longish contract because they have to keep the spot open for Mauer in 1 or 2 or 3 or X number of years. And this is exactly the reason that the Twins had zero interest in Abreu (imo).
this move also makes it more likely that Mauer is still really valuable during the Twins resurgence.