Rev 22:11 He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still.
If people sin until Jesus comes, this means that they are sinning after probation is closed and there is no mediator in the heavenly sanctuary to forgive their sins.
Sinning until Jesus Comes by Ellen White
“As Jesus moved out of the most holy place, I heard the tinkling of the bells upon His garment; and as He left, a cloud of darkness covered the inhabitants of the earth. There was then no mediator between guilty man and an offended God. While Jesus had been standing between God and guilty man, a restraint was upon the people; but when He stepped out from between man and the Father, the restraint was removed and Satan had entire control of the finally impenitent.” Early Writings, p. 280.2
“I also saw that many do not realize what they must be in order to live in the sight of the Lord without a high priest in the sanctuary through the time of trouble. Those who receive the seal of the living God and are protected in the time of trouble must reflect the image of Jesus fully.” Early Writings, p. 71.1
When Christ shall cease His work as mediator in man’s behalf, then this time of trouble will begin. Then the case of every soul will have been decided, and there will be no atoning blood to cleanse from sin. When Jesus leaves His position as man’s intercessor before God, the solemn announcement is made, “He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still.” Revelation 22:11. Then the restraining Spirit of God is withdrawn from the earth.” Patriarchs and Prophets, p. 201.2
“When He leaves the sanctuary, darkness covers the inhabitants of the earth. In that fearful time the righteous must live in the sight of a holy God without an intercessor. The restraint which has been upon the wicked is removed, and Satan has entire control of the finally impenitent.” The Great Controversy, p. 614.1
“I saw that many were neglecting the preparation so needful and were looking to the time of “refreshing” and the “latter rain” to fit them to stand in the day of the Lord and to live in His sight. Oh, how many I saw in the time of trouble without a shelter! They had neglected the needful preparation; therefore they could not receive the refreshing that all must have to fit them to live in the sight of a holy God. Those who refuse to be hewed by the prophets and fail to purify their souls in obeying the whole truth, and who are willing to believe that their condition is far better than it really is, will come up to the time of the falling of the plagues, and then see that they needed to be hewed and squared for the building. But there will be no time then to do it and no Mediator to plead their cause before the Father. Before this time the awfully solemn declaration has gone forth, “He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still.” I saw that none could share the “refreshing” unless they obtain the victory over every besetment, over pride, selfishness, love of the world, and over every wrong word and action. We should, therefore, be drawing nearer and nearer to the Lord and be earnestly seeking that preparation necessary to enable us to stand in the battle in the day of the Lord. Let all remember that God is holy and that none but holy beings can ever dwell in His presence.” Early Writings, p. 71.2