This got downvoted, but it is correct. This cable won’t be a net gain if you want to go to the moon once, twice, or even ten times, but _if_ you want to, say, build a moon colony housing thousands, and you need to launch thousands of rockets, it likely will be. A concern would be how fast this line would wear down, and what would happen if it broke. Does it destroy your lunar colony, take out a zillion satellites in earth orbit, or just float down onto the moon, and burn down in the earth’s atmosphere?