Spa's already had some troubles recently (it was gone for a year or two, wasn't it?), but luckily, I haven't heard any bad news in the last couple years.
I say we dump Bahrain, Hungary, and Russia, and add back in Germany and France. China could go too, but I suspect the manufacturers and sponsors want it on there, being a huge, growing market.
Let's also pick a better track in Spain, and bring back the European GP, rotating around various tracks every year.