I don't have detailed familiarity with what went on in recent negotiations. I know that a variety of potential reforms were tabled, both in the context of that collective bargaining and other negotiations with the other unions.
Part of the challenge is that collective bargaining is a difficult place to resolve those kinds of issues. The better pension organizations have tended to take pension issues out of collective bargaining into a specific process that is more about trying to build consensus between management and labour, and not use it as a bargaining chip when there are many other complex issues on the table.