I wonder if debris in GEO orbit is a problem for other satellites in GEO orbits. It'll be up there for a very long time I guess.

But maybe it just stays orbiting at about the same velocity in the same orbit, so it's not really a big issue for other spacecraft in GEO?

Here's a Wikipedia page with some ideas about it (look for "Higher Altitudes") -- https://en.wikipedia.org/wiki/Space_debris