The rout in French bond markets has put the crisis at the heart of the race to succeed the European Central Bank (ECB) president, with the next chief needing to contend with "bond vigilantes." As France's debt woes spark fears of eurozone turmoil and with Christine Lagarde's departure looming, Dutchman Klaas Knot or Spaniard Pablo Hernández de Cos could take the helm amid financial upheaval.