When I looked at which basic ELT qualifications employers were looking for, someone suggested doing the same for more senior positions. I decided to separate managerial roles from university positions, and here I have just looked at managerial positions, starting from Assistant Director of Studies (ADOS) and moving up.
41 (about 76%) of the jobs specified it as an essential qualification, and 9 (about 17%) wanted either the DELTA or a Master's degree, but only 4 (about 7%) only specified an MA. Therefore, it seems that if you want to move into ESL management, the DELTA may be the qualification to go for at the moment.
I looked at jobs advertised on tefl.com
. The sample size (54) was smaller than in the entry level survey because there are fewer positions, but they did cover positions around the world.