Vivendi's Jean-Marie Messier was first to go - replaced by dour civil servant Jean-RenÈ Fourtou. Then last week a 71-year-old economics professor replaced Ron Sommer, the mathematics whiz, at Deutsche Telekom and AOL Time Warner whisked chief operating officer Robert Pittman, founder of MTV, out of the door, handing full control to its chief executive, a former savings-and-loan executive.