While the resources are out there it's very feasible that we could become locked into a scenario where it is out of reach. I don't particularly care for letting

While the resources are out there it's very feasible that we could become locked into a scenario where it is out of reach. I don't particularly care for letting the cost stop us from taking it from outside Earth, but the prerequisite for doing so is having enough energy available to accomplish the goal. Which is a path we could easily close off for ourselves.