what de facto say is true ..THY just recently turned 15 737max options to confirm orders.. just the 737 order schedule is 2016=20, 2018= 20, 2019=15, 2020 30 and 2021=10 a total of 95 air frames.
now you have an additional 25 (+5 options i think) 777's, 30+ A330's and over 100 A320/321's ... all planning on joining the THY fleet by 2023
despite what other people might be saying there is no possibility IMHO that even the local market to cater for the large number of crew required even with the growing number of training organisations here... as the deadline draws closer for airframe handovers and the 2023 deadline THY will eventually change the conditions to compete with other carrier in the region to attract crew or its going to be one expensive parking lot