JOEL - That would be unfair if they did everything else right but through no fault of their own could not find an eternal spouse here.
In the Doctrine and Covenants we are told:

"Thus came the voice of the Lord unto me, saying: All who have died without a knowledge of this gospel, who would have received it if they had been permitted to tarry, shall be heirs of the celestial kingdom of God;
Also all that shall die henceforth without a knowledge of it, who would have received it with all their hearts, shall be heirs of that kingdom;
For I, the Lord, will judge all men according to their works, according to the desire of their hearts." (D&C 137:7-9)

From this scripture we can logically assume that all who have died without the opportunity having a Temple marrige, who would have done so if they had been given the opportunity, shall be able to obtain this blessing in the next life; perhaps during the Millenium. God judges all of us according to our works and the desires of our heart.

Here are some quotes from Church leaders about this:

President Boyd K. Packer said:
"Any soul who by nature or circumstance is not afforded the blessing of marriage and parenthood, or who innocently must act alone in rearing children, working to support them, will not be denied in the eternities any blessing—provided they keep the commandments." (“For Time and All Eternity,” Ensign, Nov. 1993, 21)

President Harold B. Lee said:
“[Women] who have been denied the blessings of wifehood or motherhood in this life—who say in their heart, if I could have done, I would have done, or I would give if I had, but I cannot for I have not—the Lord will bless you as though you had done, and the world to come will compensate for those who desire in their hearts the righteous blessings that they were not able to have because of no fault of their own.” (Ye Are the Light of the World, Salt Lake City: Deseret Book Co., 1974, p. 292.)

President Spencer W. Kimball said:
"And in the meantime, we promise you that insofar as eternity is concerned, no soul will be deprived of rich and high and eternal blessings for anything which that person could not help, that the Lord never fails in his promises, and that every righteous person will receive eventually all to which the person is entitled and which he or she has not forfeited through any fault of his or her own. " (“The Importance of Celestial Marriage,” Tambuli, July 1980, 1)

President Hinckley once said:
My heart reaches out to those among us, especially our single sisters, who long for marriage and cannot seem to find it. Our Father in Heaven reserves for them every promised blessing. (Ensign, May 1991, 71)

President Hinckley in a General Women's meeting said:
"Some who are not married, through no fault of their own, ask whether they will always be denied the highest degree of glory in that kingdom. I am confident that under the plan of a loving Father and a divine Redeemer, no blessing of which you are otherwise worthy will forever be denied you." (Gordon B. Hinckley, “Daughters of God,” Ensign, Nov. 1991, 97)