The last thing they need is an awkaward half-hour in the early evening schedule - they've only just got rid of that at 10pm!
7-8pm for soaps would be fine, then ideally a greater variety of "primetime" shows from 8-10pm - but the reality is ITV need to prop up nights with the soaps, and also in some slits just admit defeat and play out cheap content and accept low ratings. From a ratings perspective though ITV really do need to restore the Sunday soap hour as in the Spring and Summer without Dancing on Ice or The X Factor (and indeed now before The X Factor) ratings just collapse.
They already do have the programming for the so-called awkward half-hours....
Tonight
The Lakes/The Dales/Little England
Mayday, mayday
That Alan Titchmarsh gardening programme
All they would need to do is find "hits" for new hour long programmes for the hour long slots that would be freed up by moving aforementioned programmes to a 730pm slot. It could also mean bringing Exposure into primetime (an more decent hard-hitting current affairs and it is a formulaic programme that seems to work elsewhere in the world - best example being 60 Minutes in the US), for example the 8pm slot could look like....
Monday - Gameshows such as High stakes and Millionare
Tuesday - Award Ceremonies, Feature-length Drama's, Champions League
Wednesday - Exposure
Thursday - Travelogues Series, Countrywise and other Documentaries
Friday - Other 60 minute Gameshows