Well, let's see what I can add to this:
1) I actually like the Nine series, as my first exposure to BBAU was the first Nine season (the season Ben Norris won). I thought it was much bigger and better than our version. If Ten were to go "back to basics" at this point, it'd be a huge let down.
2) If a series without Mike Goldman makes it better, then ditch Goldman. But keep those Deputy Big Brothers. Leon needs the work.
3) The international season of Big Brother Canada worked well, why not implement that on BBAU? Bring in a HM from each of the other major countries (my picks: Nikki from the UK, Gheesling from the US, and Nick & Phil from Canada).