On the eve of opening a new home for Minneapolis’ Guthrie Theatre, managing director Tom Proehl says he’ll leave the job. “I’ve been so focused on this new building for the last 2½ years. I thought this was a good time for me to say, ‘I got us here. Let’s move on.’ The new Guthrie will be a very different place, and I think it will do well with a fresh perspective on what it can really be.”