No doubt it will drop off a bit, but i think it will go strongly for a few years at least.
As for Aussie drama debuts, that's not true. Top 10 is as follows:
Always greener - Sep 01 (2.065 million)
Sea Patrol - Jul 07 (1.971 million)
McLeods Daughters - May 96 (1.893 million)
All Saints - Feb 98 (1.688 million)
Secret Life of us - Jul 01 (1.370 million)
Marshall Law - Aug 02 (1.319 million)
Crashburn - Aug 03 (1.203 million)
Fireflies - Feb 04 (1.111 million)
Seachange - May 98 (1.059 million)
Young Lions - Jul 02 (1.054 million)
White Collar Blue - Aug 02 (1.014 million)