I agree whole heartedly with you here.
The options for the 5pm to 7:30pm are limited.
Firstly, you wouldnt move your 5pm news product and risk losing news viewers altogether.
Secondly, you have 3 real options for 6pm. One option is a news or sports based program, the second is retain a game show (perhaps try a know brand like Sale of the Century) or thirdly and least likely 4 reality franchises (screening a total of around 48 weeks between them with possibly Bondi Rescue/Bondi Vet for the balance of the year)