Priestly celibacy is a discipline; thus, it can be changed.
Historically speaking, it was long felt (as St. Paul expressed), that unmarried men were better able to serve the Lord, as they only had themselves to consider, while married men, by the definition of marriage, not only had to consider themselves but their wives, and families, too.
But the discipline could be changed, for some or for all, because “better able” does not mean that the married man could NOT serve the Lord. While I personally cannot foresee the situation that would lead the Church, under the guidance of the Holy Spirit, to proclaim that this long held discipline would be changed, that doesn’t mean the situation could not arise.
What we must do is trust to the guidance of the Holy Spirit. There have been many, MANY “crises” in the Church–in fact, we came THIS close to being not Christians but Arians when most of the hierarchy forsook Christianity for this heresy. We came THIS close to gnosticism, to Manichianism, to Islam. We came THIS close to being wiped out by pagan Rome. There have always been difficult times and there always will be, but the Church itself will stand until the end of time. You have HIS word on that.