Interesting thread.
I just don't see sustainable in the long term. To fly this amount of hours under these conditions. And, having been in a low cost (1000hrs a year) and in EK (not sure you consider it a legacy or another low cost) I can assure you that EK is far more tiring than my previous job.
I think I could cope with 1000 hrs a year of day flying. Not with 900 missing 1/3 of the night's sleep per month.
I'm under 30 and considering a career change too. And is not about money anymore, is that the way this industry is going made me hate what I used to love most: flying.