Read this passage carefully.
Psalms 115:14-16 The LORD shall increase you more and more, you and your children. (15) Ye are blessed of the LORD which made heaven and earth. (16) The heaven, even the heavens, are the LORD'S: but the earth hath he given to the children of men.
Heaven is GOD'S DOMAIN, not man's. He gave EARTH to man. Why would He create man to live an infinitesimally small duration of his existence in earth, with the vast majority of eternity future in heaven, if God gave earth to man? It's like saying man should live on earth and fulfill God's purpose for him for 70 mere years, and then get outta here and spend the rest of eternity in Heaven playing harps on clouds. i think
Genesis 1 would have stated something more about what we will do in Heaven if dying and going to Heaven was our purpose and utmost desire, and we were to spend the least amount of our existence in earth. But here we are singing about flying away, when we all get to heaven, and what a day that will be, when God is hollering at us to pray for His will in heaven to be done in earth and for the Kingdom to COME here!