Soil was at a premium in Israel. It was not unusual for a vineyard owner to give a little bit of his soil up for a fruit tree but the tree took up the best soil, the deepest soil, and required the most water. A fig tree doesn't grow fruit until three years after planting. The owner in this story, had given the tree "due season" to bear fruit and yet the tree bore no fruit. It took up valuable space and resources. The owner questioned why the tree was allowed to "even use up ground."
God had given the Israelites the choicest ground. Their land possessed everything necessary to make themselves a great nation, indeed, a light to all nations. They were strategically positioned to send the fruit of God north and south, east and west; but instead, in-fighting continued to make them a worthless fruit tree.
Every one of us and all of our churches will have to answer (from God's perspective) this same question; "Why does it even use up the ground?"