Without a doubt, Msgr Pope is totally right about what happened to mainline white Protestant churches. Sadly, there are some laity and clergy (including not a few bishops and cardinals) in the Catholic Church who look to Episcopal Church USA, United Methodist, United Church of Christ, etc., and see not failure but a model to be emulated.
As difficult as it is we must pray for these misguided souls. Forgive them, Father, for they know not what they do.