If existence is "fixed" and nothing changes then what we must be faced with is a situation where God has some difficulty getting His message to us, so He has to keep sending prophets to readdress the same old thing.
If existence is "not fixed", to wit, it "changes", then what we must be faced with is a situation where God has some difficulty getting His message to us, but there's also this "change thing", so He adjusts His message to make sense within the framework of the new reality.
Again, the solution in either case is for God to send a prophet, or even a Messiah!
All things are possible with God.
I think God is out of the sending a prophet business.
Hebrews 1:1 ¶God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,
2 Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds;
3 Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;
4 ¶Being made so much better than the angels, as he hath by inheritance obtained a more excellent name than they.
5 For unto which of the angels said he at any time, Thou art my Son, this day have I begotten thee? And again, I will be to him a Father, and he shall be to me a Son?
6 And again, when he bringeth in the firstbegotten into the world, he saith, And let all the angels of God worship him.
7 And of the angels he saith, Who maketh his angels spirits, and his ministers a flame of fire.
8 But unto the Son he saith, Thy throne, O God, is for ever and ever: a sceptre of righteousness is the sceptre of thy kingdom.