The one hour format is too fast to be inspiring for me. I like to relax, settle in, and feel good for 2 hours a night once a week. Although they need to improve the content of those two hours, e.g. show more of the nutrition angle, therapy-related issues (a la Jackie Warner's thintervention, etc.)
I'm know this is an unpopular sentiment on the boards, but that is my 2 cents.
Whateever they decide, it will be driven by ratings. If they can fit another show in that does better for one of the the existing hours, that is what they will do.