I doubt that any of us here can say categorically that anyone should lose their job over the incident although if what is written here of the circumstances is factual then certainly it has to be a possibility...
As for the crew learning from the experience... No way should a developed nations's flag carrier be employing pilots on this class of aircraft who are still learning about icing ... by now, like most of us.. they should have had the sh*t scared out of them enough times to know about icing.