I myself I am not yet emirates cabin crew, but my sister has been for almost 2 years now. And as far as turnover rate, then it is all true. Lots of people give up after 1-1,5 year.
The thing is also that depending on someone's origen, the reasons for joining may differ. There is lots of cabin crew coming from poor countries, which often times use the money to support their large famililes and on the other end you have people from rich nations that get this job mainly to travel around and party - often blowing all salary on fancy parties and then using parents/home credit cards to maintain themselves. People who have been there will definately know what I mean.