There would be nothing to see on a reality show once companies had had to agree to any editing rights they demanded. She couldn't risk the sheep actually seeing what her day involves and the planning and setting up of messes to clean with the latest product paying her. For them to finally realise that there is so much pre-recording with other's (Jamie) being filmed as her. The staged montages of the dog/kid being filmed over and over. I'd imagine there would be rules governing the use of the kids that apply to media and not so much social media the minute a production company got involved. The easiest thing when your kids may expose your social media fakeness on TV would be to not have them feature at all, but then the sheep would be questioning why given she is essentially selling their entire lives currently.
In order for them to have content to fill an hr long show every week for weeks and it not feature their very fake lives that risk exposing them to their few diehard fans, they would need to have a very heavily scripted and managed show life. Who's believing the woman who never went anywhere other than HB and B&M is suddenly going all over the place (obviously once the pandemic is over, we know there was a brief spell there when everyone else was staying at home she suddenly needed to be out all the time)? Surely her real followers would have to have questions about that. They'd then have to find something for Jamie to spend his life doing so they didn't expose him for being the gloved arms, but also didn't look like a lay-about living off his wife. And well I cannot imagine her ever being capable of pulling off a scripted life naturally. She cannot even introduce herself, a standard, expected sentence without tripping herself up.
Short of them buying somewhere stupid like a farm, and being clueless idiots trying to recreate Clarkson's Farm, I just don't see them having the TV pulling power. No one wants to watch someone sitting on their sofa in an estate in Essex who occasionally tips flour on the floor to clean for 'content'. And I think they know they'd be too exposed doing it. It works for other z-listers because they have social lives beyond their mum, or businesses that they can show because they don't rely solely on being nothing more than a covert shopping channel. The Hinches have neither and a 'reality' show risks their income if more begin to wake up to what they are actually doing.