I believe what you are inferring is that marriage is never part of God's will in heaven or that it never will exist in heaven. For some I believe that to be true. But not for all.
John 12:36
36 While ye have light, believe in the light, that ye may be the children of light. These things spake Jesus, and departed, and did hide himself from them.
In this verse Jesus expresses his desire that we should become the children of light. We should seek after the light of the gospel and submit unto the will of our Lord Jesus Christ.
Luke 16:1-8
1 And he said also unto his disciples, There was a certain rich man, which had a steward; and the same was accused unto him that he had wasted his goods.
2 And he called him, and said unto him, How is it that I hear this of thee? give an account of thy stewardship; for thou mayest be no longer steward.
3 Then the steward said within himself, What shall I do? for my lord taketh away from me the stewardship: I cannot dig; to beg I am ashamed.
4 I am resolved what to do, that, when I am put out of the stewardship, they may receive me into their houses.
5 So he called every one of his lord’s debtors unto him, and said unto the first, How much owest thou unto my lord?
6 And he said, An hundred measures of oil. And he said unto him, Take thy bill, and sit down quickly, and write fifty.
7 Then said he to another, And how much owest thou? And he said, An hundred measures of wheat. And he said unto him, Take thy bill, and write fourscore.
8 And the lord commended the unjust steward, because he had done wisely: for the children of this world are in their generation wiser than the children of light.
In the above verses, we see that an unfaithful steward perceiving to lose his stewardship with his lord, settled with the debtors of the lord for less than what they actually owed. Even though the unjust steward was cheating his lord, he was making good friends with those outside in hopes that when he lost his stewardship that they might receive him into their houses. The lord commended the unjust steward for his wisdom. What I wish to bring to your attention is verse 8. In that verse, Jesus contrasts the children of this world with the children of light. So the children of this world are not those who have been seeking the light of the gospel. But they do prepare better for failure than the children of light in this parable.
Now going back to whom Jesus was referring to when he was asked by the Sadducees (who did not believe the gospel of Christ and insisted that there was no resurrection). Jesus states:
Luke 20:34
34 And Jesus answering said unto them,
The children of this world marry, and are given in marriage:
So Jesus is talking about those who marry and are given in marriage who are among "the children of this world". Some of "the children of this world" may live very righteous lives and be worthy to enter the kingdom of heaven. However, if they remain "the children of this world" up until their resurrection, they will not inherit the highest degree in the kingdom of heaven. So when they get to the lower degrees of the kingdom of heaven, they will never have accepted the priesthood and sealing power thereof which includes the sealings of celestial marriage. Because of this, they will not advance any further than the angels who are in heaven.
Jesus in his answer to the Sadducees is directing his answer to them specifically. He is telling them, yes there is a resurrection of the dead and that he is not the God of the dead but the God of the living. He is also telling them that the family relationships they have in this world will not continue for them if they don't receive the light of the gospel and become children of light, that after they resurrect, they will not receive the sealing power of the gospel but if they are righteous enough to make it to the kingdom of heaven, they progress no further than becoming only as the angels in heaven for the rest of eternity instead being sealed to their family for eternity.
Doctrine and Covenants 131:1-4
1 In the celestial glory there are three heavens or degrees;
2 And in order to obtain the highest, a man must enter into this order of the priesthood [meaning the new and everlasting covenant of marriage];
3 And if he does not, he cannot obtain it.
4 He may enter into the other, but that is the end of his kingdom; he cannot have an increase.
The kingdom of heaven is also known as the celestial kingdom. The above verses tell us that mankind must receive the new and everlasting covenant of marriage or they cannot reach the highest degree in the celestial kingdom.
God's Plan for Families