There are a lot of issues to consider for an airline to swich from the traditional ATPL syllabus to the MPL syllabus, and it is not easy coming to a decision. If pilots are self-sponsored, then it is unlikely that they would be bonded by an airline for a long time, and this would increase the turnover rate after some time. The MPL syllabus may not necessarily be totally better than the ATPL syllabus too - a pilot may be trained to be too dependent on the opinions of others before executing an action. In the event that he has to make a split second decision in the cockpit, there will be a psychological barrier that prevents him from carrying it out immediately because of the way he has been trained. There is also less solo flying too with the MPL syllabus. But consider the recent event where a captain had a cardiac arrest and the FO had to decide on his own, divert and land the aircraft himself. Just my two cents worth...