The spinoff show host said that she is still half-expecting to see a story about the reality series' return every time she reads the newspapers.
Speaking to DS, the 34-year-old revealed: "It hasn't sunk in yet. I'm still waiting to open the newspaper one day and go, 'Ahh', and see the shock headline, 'Channel 4 Bring Back Big Brother', or 'Channel 5 Have Bought It'. I'm waiting for that to happen and I'm really not sure it's going to. Talk to me about it next year and I'll probably be crying, 'Bring it back'."
Willis also explained that she had originally applied for the job of hosting Big Brother's Little Brother in 2008, but lost out to Zezi Ifore.
"I was desperate for it and it was my dream job," she said. "I was so thankful that they offered me the chance to do it this year, but it would have been brilliant to do it the whole time with George [Lamb] because we got on so well.
"I'm just glad that I got to do something on it before it left. I would have been really sad to have never been involved in the whole thing being a die-hard and all that."
She further admitted that she would be reluctant to get involved in any future Big Brother series that didn't involve Davina McCall or that shook up the format drastically.
"It would be weird and it would all depend on who it was and what they planned for it. As a fan I am very loyal to the show and changes wouldn't always make me happy," she said. "It would depend on who, what and when.
"As for someone asking me to front it, that would be the hardest decision to make. I love Davina and nobody could do that as well as her. What lovely big shoes to fill. I think whoever did take over would get ripped apart for it. People would be used to Davina and people generally don't like change, so I would be honoured as a fan, but it would be a really scary decision."
Willis is hosting Britain's Next Top Model Live at London's ExCeL centre from October 22 to October 24.