The most accurate assessment of the long-term implications of Ivan IV's time as ruler of the Russian Empire is:
His struggles with the boyars led them to continue to decline in power and status in the years after his rule.
Ivan IV, also known as Ivan the Terrible, had a tumultuous relationship with the boyar class (the nobility) during his reign, which resulted in significant consequences for their power and status in the years following his reign. His efforts to centralize power and diminish the influence of the boyars helped to set a precedent for stronger autocratic rule in Russia, which continued in the subsequent eras.