Matthew 13, where the parable of the wheat and the tares is described, concerns the kingdom of heaven, as can be seen repeatedly from its verses.
11 Jesus answered them, "To you it has been granted to know the mysteries of the kingdom of heaven, but to them it has not been granted.
19 "When anyone hears the word of the kingdom and does not understand it, the evil one comes and snatches away what has been sown in his heart. This is the one on whom seed was sown beside the road.
24 Jesus presented another parable to them, saying, "The **kingdom of heaven **may be compared to a man who sowed good seed in his field.
31 He presented another parable to them, saying, "The **kingdom of heaven **is like a mustard seed, which a man took and sowed in his field;
33 He spoke another parable to them, “The **kingdom of heaven **is like leaven, which a woman took and hid in three pecks of flour until it was all leavened.”
38 and the field is the world; and as for the good seed, these are the sons of the kingdom; and the tares are the sons of the evil one;
41 "The Son of Man will send forth His angels, and they will gather out of His kingdom all stumbling blocks, and those who commit lawlessness,
43 "Then THE RIGHTEOUS WILL SHINE FORTH AS THE SUN in the kingdom of their Father. He who has ears, let him hear.
44 "The **kingdom of heaven **is like a treasure hidden in the field, which a man found and hid again; and from joy over it he goes and sells all that he has and buys that field.
45 "Again, the **kingdom of heaven **is like a merchant seeking fine pearls,
47 "Again, the **kingdom of heaven **is like a dragnet cast into the sea, and gathering fish of every kind;
52 And Jesus said to them, “Therefore every scribe who has become a disciple of the **kingdom of heaven **is like a head of a household, who brings out of his treasure things new and old.”
The kingdom of heaven is not the same as heaven, for there is violence in the kingdom of heaven but not in heaven (Matthew 11:12 From the days of John the Baptist until now the kingdom of heaven suffers violence, and violent men take it by force).
Thus, the kingdom of heaven seems to involve life on earth. So, is this concern about the application of Matthew 13 to the ultimate fate of all humans misplaced?