What about when they focused on jargon in particular in some year
and i think they did focus solely on PC stuff one year as well
Usually that sort of stuff fits into one paragraph but vcaa makes it an essay
Jargon is a pretty big topic in itself. Remember that a lot of slang can be classifiable under jargon as well. You can look at the uses for jargon (linguistic precision, expediency, educational marker, social group marker) and misuse of jargon (To obscure, conceal, cause prolixity, create false authority, exclude).
You have areas such as profession specific jargon (medical, legal, computing, linguistic), group specific jargon (Teenspeak, surfie speak, skating speak etc) and the jargon of business and government institutions (to obscure, mislead, Jargon being used as doublespeak etc).
There should easily be enough in there to flesh out 800-1000 words of discussion with examples.
As for something solely on PC, remember you can branch out and look at euphemisms here. Look at how PC has facilitated social harmony or dulled our language. Changing attitudes towards what is considered PC.and the recent changes to promote equality. Basically if you measure up both sides of the issue, you can quite easily fill a whole essay on this topic.
2007's speech making topic was probably one of the worst I've ever seen. There's pretty much no chance that all three topics will be something like that anyway so it shouldn't be a concern. If you get a topic like this, just avoid it and go for the easier one.