You don't have to stay there. Benefit what you can from the 121 training and multi-crew environment. 121 CRM is priceless if you get it at the right place.
The down side:
People hang in waiting for things to change, even low timers which baffles me. I have no idea what your time or experience is, but if you are new to 121 all I can say regarding all the replies about long upgrade, bending over etc, is get in, pay some dues, get what you can and move on.
Keep networking and don't burn your bridges.
The airlines may suck overall, but it's a great place to get free training. Don't feel guilty, you will be working for peanuts anyway.