No way them wanting to move is because the house is 'too big'... especially if they are having more children in the future they need this space and they know it. It mostly seems to be that this house has too much character and it's too much work for them to renovate it all to turn it into one big influencer-beige paste, and to be honest I also think the title was click bait because they do say in the video that it probably wouldn't be possible to move now anyway because they both just became self employed.
I am a bit surprise that they are going to do more challenge videos, I'm not going to watch those (they did like a baking challenge a while ago I think and I only made it a few minutes into the video). Their audience is probably young parents, I don't think they'd care about those challenge videos? They are nearly thirty and I'm guessing their audience is late twenties/thirties as well while challenge videos would target a much younger audience, unless that is what they are trying to do? I used to love their content when they were a bit more down to earth, but I'm not interested in watching them do 'order what the person in front of you orders' as Fab mentioned in their last vlog...