23Furthermore, the former priests were many in number, because they were prevented by death from continuing in office; 24but he holds his priesthood permanently, because he continues forever. 25Consequently he is able for all time to save those who approach God through him, since he always lives to make intercession for them. 26For it was fitting that we should have such a high priest, holy, blameless, undefiled, separated from sinners, and exalted above the heavens. 27Unlike the other high priests, he has no need to offer sacrifices day after day, first for his own sins, and then for those of the people; this he did once for all when he offered himself. 28For the law appoints as high priests those who are subject to weakness, but the word of the oath, which came later than the law, appoints a Son who has been made perfect forever. (Hebrews 7:23-28, NRSV)
Jesus doesn’t need a replacement. He is always going to be our high priest. There is nothing that will keep him from interceding for us. Because of the promise that God made.
All of the rest of us are weak but Jesus will stand forever.