Feel free to debate my point of view, but I'd argue that staying would be essentially "re-founding" the company. Because senior engineering experience is gone and in it's place, a team composed of only people with <6 month experience with the codebase.
If I found a company, I'd like to be able to choose the product concept, choose who I work with, and start with a fresh cap table / debt load, etc.
Is this a product you believe in enough to (re)-"start" a company for? Are these the people you'd pick for starting a company? What's the financial situation?