The logical conclusion of mainline Protestantism is secularism, and we are seeing the fruit in declining historical Protestant denominations liberal Catholics wish to emulate. 

Hysteria directed against our separated brethren is bad, but so too is indifferentism. Those who cloak themselves in Vatican II forget to mention the Church taught at that very Council that she alone possesses the fullness of the means of salvation and that communities arising from the Reformation haven’t preserved Holy orders or the Eucharist.