There were 33 of them this season - three have already been replaced (Price, Matheny, Banister), two of them with interim place-holders. We know the Blue Jays and Rangers will definitely be looking for someone new for next year. The Reds probably will as well (interim skipper Jim Riggelman is described as a candidate for next year, but he's also 65 years old.) Maybe the Angels and Royals will make a change. Maybe the Mets.
The Blue Jays have hired 11 managers in franchise history (two of them they hired twice), and nine of those men had never managed in the major leagues before getting the Toronto job.