Yes, they could. However we have centuries of experience with cables, so that would be the lowest risk item in the entire vehicle. Yes, in zero-G. Fortunately we will not be using a solar sail on this. Of course; there will undoubtedly be a test to make sure the engineering is solid. But as I mentioned, that will be a test of the engineering of the system, not the development of any new technology. I was replying to your statement "At great cost this technology could indeed be developed." The technology does not need to be developed and it will not come at great cost.