I can think of nothing worse than spending 30 years flying the same airplane. Your brain will rot. Actually, 30 years of flying airliners is in itself a sentence. I can't wait for the day to actually fly an airplane again. If you have to spend 11 to 15 hours flying straight and level, you might as well learn how to do it in a different airplane.
Maybe that's just me. You do know this job is killing us and it's not getting better.