That's because they didn't tell anyone they were moving the show!
Like after last week's episode maybe announce in the coming attractions section that there's going to be a new night? That's okay, we're all psychic.
The way they did it, I think it was all PR spin. If they wanted to give the show a real chance, they needed to tell the viewers. (I noticed my DVR didn't catch the time change and I needed to plug it in manually.)