She'd have to let him go. They can get divorced, split any assets (ha!) and get on with it. The kids are grown up so she can't blackmail him with custody wrangles.
I expect he's mainly stuck because of the debt and not really fancying half of that. She's probably telling him she has a plan and he probably doesn't, so he's there for the foreseeable until she either makes her authoring fortune or robs a bank.
I love the rebranding. It's such a 90s boss babe vibe. Don't we all hang out in forests wearing blazers and transacting business on our Nokia 6610s?