Historian Marc B. Shapiro writes:
כנראה שהר’ ז”ל [רש”י] כאב הבנות הפך בזכותן בכל ואולי מזה הצד הוסיף כפייה לחליצה שלא כדברי שאר הפוסקים.
His position, which recognizes the possibility of change in this matter guided by Modern Orthodox/Religious Zionist halakhic authorities, is much more nuanced than what we have been hearing recently. R. Lichtenstein recognized that changes occur and he was honest enough to admit that he didn’t know what the future will bring.