The blessedness of which the psalm speaks does not mean that we will be materially/financially prosperous. It may actually be the contrary; exactly because of the role the wicked plays in the church. The blessedness promised is the divine presence in the life of the true believer, even when there will be times of suffering.
1 Heureux l'homme qui ne marche pas selon le conseil des méchants,Qui ne s'arrête pas sur la voie des pécheurs,Et qui ne s'assied pas en compagnie des moqueurs,