It is based in dogma. It seems unlikely that it will ever change. There is a great article related to this in the Miles Christi newsletter from December 2016. It extensively quotes an October 25 instruction from the CDF called Ad resurgendum cum Christo (To rise with Christ). Here are just a few gems:
“… by burying the bodies of the faithful, the Church confirms her faith in the resurrection of the body, and intends to show the great dignity of the body…”
“it is impossible to deny the real continuity between the buried body and the risen body… Chhristian resurrection is not therefore a reincarnation of the soul in an indifferent body; nor is it an ex nihilo recreation. The Church has never ceased to affirm that it is precisely the body in which we live and die that will be revived on the final day.”
“… even though the Church now does not condemn cremation, the preference should always be to bury the bodies of the deceased…”
“When, for legitimate motives, cremation of the body has been chosen, the ashes of the faithful must be laid to rest in a sacred place, that is, a cemetary or, in certain cases, in a church or an area which has been set aside for this purpose, and so dedicated by the competent ecclesial authority.”
“The conservation of the ashes of the departed in a domestic residence is not permitted” except in certain cases and with permission of the bishop. “… ashes may not be divided among various family members…”
“In order that every appearance of pantheism, naturalism, or nihilism be avoided, it is not permitted to scatter the ashes of the faithful departed in the air, on land, at sea, or in some other way…”
