Just for the illustration how some experienced captains and 737 instructors over there are thinking (quote from an interview on ihned.cz):
"Kdyby odešel i druhý motor, letadlo by přistálo v terénu, takové případy jsou, většinou dopadly dobře. ", " Cestující nebyli přímo ohroženi. "
Rough translation: Even if the other engine became unoperative, the plane would have landed in the fields. Such cases happened, usually ended well. Passengers were not in direct danger.