Jesus makes all things new.
Jesus' kingdom is not of this world, so we need to focus on Heaven much more than we focus on Earth.
If we do not pray for Jesus to return, does that reveal a deficiency in our love for him?
There is a lot more to life than just getting to Heaven. Unity with God begins now, in this life.
Heaven is the event of union with God, which begins now. God will recreate the "heavens and the earth".