The Reason why Ethan & Scott decided to close Yolodice isn't about they have a dice game only, but rather the time they spent on it. They already too busy to keep running yolodice (they don't have time to spend on other things), so they decided to close yolodice. There are already too many sites offer sportbook, so i don't think they need to consider it when they deciced to re-launch Yolodice.
I may not agree to what you have said mate, Ethan and Scott have more ways if maintaining the site by hiring good and intelligent workers across every problems, a competent and due diligent developer will be handling yolodice while ethan and Scott go to bed to sleep while the site is running smoothly, to me the reason they stop operating is because, so many competitive cryptocurrency gambling platforms are emerging rapidly in the space with new gambling features far more better than yolo interface, there affecting customers from patronising them, on that note, yolo have to shutdown and maybe will sit back and rethink new features and strategies to come out with.