It's not hard to fathom why senior pilots have stayed on at OH.
After the strike life was good at OH. When I was hired in '03 it was touted as "A place you can stay". Life was very good for those senior. Pay for those most senior was about upper 90's or so, retirement, excellent pass benefits, and because of PBS they bid what fit their personal needs and some were living the dream.
I flew with some who were content and had no desire to leave. Some Capt's I flew with saw OH as a means to an end and some saw it as an end.
Hopefully things do not close up at OH but if they make it out of this drama this should be a strong wake up call to move on to the majors and not be picky about where you go.