Did the Lord's messenger ever predict the downfall of the SDA church? YES!
“Of those who boast of their light, and yet fail to walk in it, Christ says, ‘but I say unto you, it shall be more tolerable for Tyre and Sidon at the Day of Judgment, than for you. And thou, Capernaum[Seventh-day Adventists, who have had great light], which art exalted unto heaven [in point of privilege], shalt be brought down to hell: for if the mighty works, which have been done in thee, had been done in Sodom, it would have remained until this day. But I say unto you, that it shall be more tolerable for the land of Sodom in the Day of Judgment, than for thee.’ At that time Jesus answered and said, "I thank thee, O Father, Lord of heaven and earth, because thou hast hid these things from the wise and prudent [in their own estimation], and hast revealed them unto babes.” {RH, August 1, 1893}. [THE BRACKETED COMMENTS ARE BY ELLEN WHITE].
That Ellen White never excluded from her writings the possibility of the SDA church falling and becoming part of fallen Babylon is further evidenced in the following quote:
“We must as a people arouse and cleanse the camp of Israel. Licentiousness, unlawful intimacy, and unholy practices are coming in among us in a large degree; and ministers who are handling sacred things are guilty of sin in this respect. They are coveting their neighbors' wives, and the seventh commandment is broken. We are in danger of becoming a sister to fallen Babylon, of allowing our churches to become corrupted, and filled with every foul spirit, a cage for every unclean and hateful bird; and will we be clear unless we make decided movements to cure the existing evil?” {21MR, p 380, 1886}.
In 1894 Ellen White confirmed in the following quote that the SDA church did not heed the Lord's council of not being married to the world:
“The church has taken the world into her fellowship, and has given her affections to the enemies of holiness. The church and the world are standing on the same ground in transgression of the law of God. The church prefers to assimilate to the world rather than separate from its customs and vanities'. {ST, March 12, 1894}.