I've never liked Sentai Filmworks, so it doesn't surprise me too much. Fortunately, I've seen all the ones in that list I like for the most part, so them leaving is no big deal.
Hulu announces anime leaving like every 6 months and then magically they unexpire like 2 months later.
We'll see if they stay off Crunchyroll that long. It won't surprise me if most of them come back in less than a year.
FYI, Sony Music really has nothing to do with anime except maybe some seiyuu that it represents in a subsidiary (mostly because they are primarily singers).