I have asked the question, as I am sure you have, “Why doesn’t God just take us all out right now?” Owen nails it right here. (Emphasis mine)
Now God takes believers, that they may be a kind of first-fruits unto himself of the creatures. He satisfies himself with believers throughout the world, to be first-fruits of the whole creation. And if God should cease from taking these first-fruits, he would destroy the world. To what end should he maintain this fabric at such an expense of power, patience, forbearance, goodness, wisdom, if there came no revenue to him? Now, he never took any revenue but the first-fruits. And if any one …. do put forth his hands to this portion of God, he will be sure sorely to revenge it.
-John Owen, Volume 9, page 287, from a sermon entitled, A Christian, God’s Temple