I see a potential that goes beyond making demo sites. This product could already be used to sandbox a website to test plugin and core updates and make sure that they don't break the live website. In case it happens, you can work on a solution on the sandboxed website, and at the end let the system clean the sandbox automatically. I'd say that this would be a great solution, and would save countless hours to the people that makes the maintenance of a website. The only problem is that the website must be multisite but if they could modify the system to create 'test sandboxes' automatically also in a normal website it could be another untapped niche.