Edward L. Kimball cites Spencer W. Kimball's statements that the Lord's timetable operates independent of pressure.
Edward L. Kimball, "Spencer W. Kimball and the Revelation on Priesthood." BYU Studies 47, no. 2 (2008): 5–78
. . .
But others thought it presumptuous for members to do anything but wait patiently and faithfully defend the Church’s position. Spencer Kimball, to whom loyalty was an article of faith, placed himself in this latter group. In two letters to his son Ed in 1963, he explained: “These smart members who would force the issue, and there are many of them, cheapen the issue and certainly bring into contempt the sacred principle of revelation and divine authority.”
Continuing the dialogue a few days later, he added: "The conferring of priesthood, and declining to give the priesthood is not a matter of my choice nor of President McKay’s. It is the Lord’s program. . . . When the Lord is ready to relax the restriction, it will come whether there is pressure or not. This is my faith. Until then, I shall try to fight on. . . . I have always prided myself on being about as unprejudiced as to race as any man. I think my work with the minorities would prove that, but I am so completely convinced that the prophets know what they are doing and the Lord knows what he is doing, that I am willing to rest it there." (pp. 28–29)