I think you know the answer
The fact that you have to ask if its worth doing tells me that you have already made up your mind. You have had a fATPL for a while now and your seriously asking if you should take a job being handed to you on a plate? Everyone is whining about TP pidgeon holing but can you honestly say that having 1000 hours in a TP won't put you in a better position than someone with only 250 hours?
The no progression from TP thing has only seemed to come to light since the global slow down. Before 2008 no one seemed to have a problem. It's all supply and demand. Demand now is for type rated + 500 hours or be a cadet from a seriously overpriced feeder flight school. This situation wont last forever. Get in your TP and use that licence that cost you a small fortune.