"God resists the proud, But gives grace to the humble. Therefore humble yourselves under the mighty hand of God, that He may exalt you in due time," 1 Peter 5:5-6
It is almost inevitable that after Nicolaitans seize a church, the attendance goes down. They do not humble themselves by admitting that something is wrong, because they feel that since they are in power, things are going well. And they do not submit to authority; rather, they seize it. Since God is resisting them, their various plans and programs cannot reverse the decline of the church.
Soul-winners, on the other hand, cause church growth. Sometimes, they slow or even reverse the church's decline. But, inevitably, the soul-winners see that the Nicolaitans are cancelling them out. By submitting to authority, soul-winners receive the promise that God will exalt them at the proper time, which often means that they have to separate from a Nicolaitan church. The Nicolaitans then blame the soul-winners (instead of themselves) for the decline in attendance. When the soul-winners explain what happened, the Nicolaitans accuse them of bad-mouthing the church, and heap further blame on the soul-winners for the church's decline.
Soul-winners do not always get exalted to leadership positions. Instead, God elevates them to be better soul-winners. And since God cares about their new converts, He often leads them away from Nicolaitan churches.