Liberal Catholicism was never endorsed by the Vatican. Even economic beliefs like social justice are not shared by all dioceses. It's far from dead.
I mean, social justice and economic issues are different. Social justice issues are not directly at odds with official church teaching. If anything, they are natural extensions (to some), or incorrect extensions (to others).
But the radical social leftism of the Pelosi-Kennedy types are directly at odds with the core beliefs of the Church. And I don't see a future for /that/ kind of leftism.
That was never part of the church.