Huh, very interesting. Yes, I wonder where current materials engineering puts us for a maximum length cable. It might be usable to just fly a plane up to it at some point. This also brings to mind capturing an asteroid in LEO. (Surely super dangerous though.)
I can't help but think SpaceX and the rest of us are missing out by targeting places like the moon or mars when there are so many asteroids out there. Maybe some of them could be used as a space station or slowly morphed into a spaceship with higher mass than we could ever launch? (like 1036 ganymed)