He didn't really stand still though, did he? He just didn't make moves to the degree that some other teams did, but with a 108 win team, there's not much upgrade to be done. There's also the saying that "if it ain't broke, don't fix it."
The GM's job is to put together a team, on paper, that is a legitimate contender. Dombrowski did that. What happens on the field is out of his control.