Personally, I hope that Today Tonight is never revived on the East Coast. Aside from the fact that I despise programs like this (and ACA certainly isn't much better in this regard), it's been nearly three years since it was axed. One would like to think that the East Coast has well and truly moved on from TT by now.
I think that a Naomi Robson comeback is highly unlikely too. A very controversial presenter (especially towards the end of her time on the show) with the leaked outtakes, the Wa Wa debacle, presenting coverage of Steve Irwin's death with a lizard on her neck, etc. Mind you, at the same time I do wonder what Naomi Robson is even doing these days?! I don't think we've heard much from her since she was on Dancing With The Stars and that was back in 2007!
As far as Home & Away is concerned (which is for another topic, mind you), that show has certainly seen better days in the ratings. I don't think Seven are likely to axe it anytime soon but I definitely think they need to do something to reinvigorate some interest in markets like Sydney & Melbourne where H&A is often 3rd in it's timeslot.
Although isn't Seven News in Adelaide & Perth hour long on (most) weekends these days?
They probably wouldn't until Rick/Sue and John/Jane retire at the very earliest but if Seven's Perth & Adelaide 6pm bulletins were extended to an hour on weeknights, I'm sure that viewers in those two cities would continue to watch it (Like how Perth/Adelaide will watch almost everything else that airs on Seven in large numbers!).