Young people are leaving the church in droves because, unlike older people, they know injustice when they see it, and they see injustice in the Catholic Church everywhere: in women who are denied access to all the sacraments, in gay people, who are denied access all the sacraments, and they rightly make value judgments based on what they see. Until injustice is replaced with justice, another synod isn't going to make one bit of difference in attracting more young people or convincing them to stay in the pews. It's just rearranging deck chairs on the Titanic.