Real world: Stop the money and they will say, "why should we listen to you, who don't give us money?"
And no-one, even a liberal, likes to admit to himself that he can be bought.
I disagree, The Archdiocese of Boston changed its toon when donations fell after Cardnal Law refused to address the Priest Sex Abuse scandel, it even resulted in Law's "retirement" after the Faithful found out their donations were going to pay hush money claims.
Cut off the money, they will be very open to your point of view.
If they were foolish enough to take the position you propose it would expose them for what they have become, and they too would be "retiring" very quickly, and the Church would again exercise it moral authoriety.