Under the old say "the devil you know," it appears that if 3M stays the course, Mike will be around another 2 to 3 years followed by (probably Vale).
Meanwhile, kind of interesting (but not surprising) to hear Inge and Mike were worried about 3M getting pressured by an activist investor in 2015 so they did whatever they had to (sold off Tartan, which really sucked for people who liked going there) avoiding this.
Activists are known for bringing in outside leadership as CEO and other top roles. Also cost cutting galore.
Given a choice, which one would you prefer?