Story of my life! Except the system was our bread winner and the redesign was no secrecy. We knew something was wrong but we all wanted to see the company succe

Story of my life! Except the system was our bread winner and the redesign was no secrecy. We knew something was wrong but we all wanted to see the company succeed so we kept going way after the project was late and over budget. In the end we failed and everyone competent left. My advice will be that you leave if you can. If that is not an option then work up the courage to tell some higher ups what's going on. You will burn bridges with the manager but you will save yourself and the rest of your team from the pain of coming to work every morning knowing they are partly responsible for something bad that is about to happen.