We will see Jesus sitting on his throne in the sky.
Jesus is not going to sit on a throne from earth.
In fact, when the time comes for Jesus to live on the NEW earth with us---he will hand over the kingdom to the Father.
The promise of the seed from David is COMPLETE IN THAT HIS OWN SEED IS SITTING ON GOD's THRONE.
It is unbelievable that you cannot see it.
You link yourself with the unbelieving nations and the unbelieving 'people/Israel' when you set yourself against GOD's setting of His King Messiah Jesus on David's throne...Zion.
Psa 2:1 Why do the heathen[nations] rage, and the people[Israel] imagine a vain thing?
Psa 2:2 The kings of the earth set themselves, and the rulers take counsel together, against the LORD, and against his anointed, saying,
Psa 2:3 Let us break their bands asunder, and cast away their cords from us.
Psa 2:4 He that sitteth in the heavens shall laugh: the Lord shall have them in derision.
Psa 2:5 Then shall he speak unto them in his wrath, and vex them in his sore displeasure.
Psa 2:6 Yet have I set my king upon my holy hill of Zion.
Psa 2:7 I will declare the decree: the LORD hath said unto me, Thou art my Son; this day have I begotten thee.
Psa 2:8 Ask of me, and I shall give thee the heathen[nations] for thine inheritance, and the uttermost parts of the earth for thy possession.
Psa 2:9 Thou shalt break them with a rod of iron; thou shalt dash them in pieces like a potter's vessel.