Yes, I'd think that would be the goal. Long term habitation will need plants of many kinds. Just start listing all the ways people benefit from plants and you'll see the list just goes on and on. At the huge price per kilogram of launched mass, making soil out of local materials and developing closed-loop systems just makes economic sense. Soil is a living thing after all, it doesn't wear out or go away. (Older than dirt!) Learning how to make healthy functioning soil from native regolith is an important part of the whole in-situ resource utilization push from the major space agencies.