That would assume you could adjust all the satellites' orbits. Whilst some satellites have proper propulsion, I think many just have minor systems to only adjust their rotation, and a lot have none. And don't forget all the dead ones that are orbiting space junk.

So you decommission and deorbit anything that can't be controlled. Once you have a functional beanstalk the entire cost/benefit of doing everything in space changes. It becomes a lot easier to put things in orbit and it becomes a lot more important to keep the beanstalk up.