Snape needs to be locked inside a research laboratory and never let out again

I often think that it's a pity that there doesn't seem to be any university/college equivalent in the wizarding world. Snape so clearly needs to be teaching only those who actually have a passionate interest in learning his subject. Since the nearest we have to that is the NEWTs, it'll be interesting to see whether his sixth and seventh year classes are any less scarifying, when his students have at least chosen to take his class.

Remus might do very well coaching trainee Aurors, with everyone concerned fully aware that he's a werewolf. He'd be reasonably good as an Auror, of course (so long as you gave him one week in four off), but it would be a shame to waste his abilities as a teacher by not making use of them in some way.