Well the question is self-explanatory, really. Sadly, for his own good, i think it's time the Aussie selectors went for someone a little more seasoned. I'm all for taking advantage of Brett Lee's pace whilst he's got it but the Aussie selectors seem to want to avoid that. They seem to want him to be a line-and-length bowler of lesser pace and I think it's seriously affecting his bowling.
To me, when you have someone of real pace, you need to use it while you can, not try to convert them into something they're not. Maybe the Aussie selectors should drop him until he's developed the line-and-length aspect of his play when his pace has gone.
Either way, Brett Lee's ability is in his pace and if the Aussies don't want to capitalise on it, why is he even in the side?
So I say if you're not going to use his talent, drop him for Bichel or someone young like Bracken or Stuart Clarke.