The thing is this — HISTORICALLY, Priests were NOT REQUIRED to be unmarried.
For example, the Apostle Peter, who the Catholic Church considers their first Pope, was a married man. St. Patrick was the grandson of a Priest.
It was not until ecumenical meetings of the Catholic Church at the First and Second Lateran councils in 1123 and 1139 that priests were explicitly forbidden from marrying.
Eliminating the prospect of marriage had the added benefit of ensuring that children or wives of priests did not make claims on property acquired throughout a priest’s life, which thus could be retained by the church. It took centuries for the practice of celibacy to become widespread, but it eventually became the norm in the Western Catholic church.
today, if you speak to a priest and ask him why celibacy is required, he will tell you that the Catholic church regards it as being easier for unattached men to commit to the church, as they have more time for devotion and fewer distractions.
However, it is NOT DOGMA or DOCTRINE.
So, I think, Celibacy is considered a “discipline” of the church, which can be changed, rather than a “dogma”, or a divinely revealed truth from God which cannot be altered.
God's plan for the leadership in the church is MARRIED men.
1 Timothy 3:1-13 The saying is trustworthy: If anyone aspires to the office of overseer, he desires a noble task. Therefore an overseer must be above reproach, the husband of one wife, sober-minded, self-controlled, respectable, hospitable, able to teach, not a drunkard, not violent but gentle, not quarrelsome, not a lover of money. He must manage his own household well, with all dignity keeping his children submissive, for if someone does not know how to manage his own household, how will he care for God's church? He must not be a recent convert, or he may become puffed up with conceit and fall into the condemnation of the devil. Moreover, he must be well thought of by outsiders, so that he may not fall into disgrace, into a snare of the devil.
Deacons likewise must be dignified, not double-tongued, not addicted to much wine, not greedy for dishonest gain. They must hold the mystery of the faith with a clear conscience. And let them also be tested first; then let them serve as deacons if they prove themselves blameless. Their wives likewise must be dignified, not slanderers, but sober-minded, faithful in all things. Let deacons each be the husband of one wife, managing their children and their own households well. For those who serve well as deacons gain a good standing for themselves and also great confidence in the faith that is in Christ Jesus.
Titus 1:5-16 This is why I left you in Crete, so that you might put what remained into order, and appoint elders in every town as I directed you— if anyone is above reproach, the husband of one wife, and his children are believers and not open to the charge of debauchery or insubordination. For an overseer, as God's steward, must be above reproach. He must not be arrogant or quick-tempered or a drunkard or violent or greedy for gain, but hospitable, a lover of good, self-controlled, upright, holy, and disciplined. He must hold firm to the trustworthy word as taught, so that he may be able to give instruction in sound doctrine and also to rebuke those who contradict it.
For there are many who are insubordinate, empty talkers and deceivers, especially those of the circumcision party. They must be silenced, since they are upsetting whole families by teaching for shameful gain what they ought not to teach. One of the Cretans, a prophet of their own, said, “Cretans are always liars, evil beasts, lazy gluttons.” This testimony is true. Therefore rebuke them sharply, that they may be sound in the faith, not devoting themselves to Jewish myths and the commands of people who turn away from the truth. To the pure, all things are pure, but to the defiled and unbelieving, nothing is pure; but both their minds and their consciences are defiled. They profess to know God, but they deny him by their works. They are detestable, disobedient, unfit for any good work.
Those councils reiterated what was the long-standing expectation, if not the universal practice.
Eliminating the prospect of marriage had the added benefit of ensuring that children or wives of priests did not make claims on property acquired throughout a priest’s life, which thus could be retained by the church.
As far as I have been able to determine, diocesan priests have always been able to will their own property to anyone they pleased.