The Church does not change insomuch as it clarifies for our finite minds that which God teaches (which has come from the Bible and Apostolic tradition). At various points in time (you posit every half century or so), the Church needs to address ideas that have found a way into the Church which sow confusion among the faithful and create chaos in the world.

The problem today is that those ideas which are not of God (Liberalism, the synthesis of all errors) have been sown and allowed to thrive because the "gardeners" (the Church hierarchy) are lax in their duties, ill-trained in their job, or perhaps even just bent on seeing the Church destroyed.

Every 2000 years or so, the "measure of iniquity" fills and requires Divine intervention. The last time that happened, Christ (God Himself) came into the world, and "the world received Him not" (John 1:10).

He established His Church before His Resurrection. In the ensuing 2000 years, the Church has weathered many challenges and corrected course when necessary. In those times God intervened by way of raising great men and women of love and faith to right the errors that crept into the Church. (The Great Schism and the Protestant Revolt).

At this point, however, the errors and corruption seem to be so expansive in the Church that it might take the intervention of Our Lord to cleanse it in much the same way as He cast the money-changers from the Temple.

There are bright spots, though. The Faith of All Times still thrives among the Faithful. There are some prelates who have stayed the course and continue to bring the Sacrifice of the Mass, and the unaltered sacraments to millions of Catholics throughout the world.

"And I say to thee: That thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it. And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven; and whatsoever thou shalt loose upon earth, it shall be loosed also in heaven". (Matt. 16:18-19)

If there is a reformation coming, as you say, then it will be more of the world conforming to God and His plan, and not God conforming to the world.

Thanks for the read.