Been There, Done That
The main reason why this show should succeed is that HBO has so much experience. They’ve made fantasy worlds including Westworld as well as Game of Thrones. Meanwhile, they made mistakes in the latter GOT series, which taught them many lessons (via Bloomberg).
They received a learning curve as they discovered what works and what fans won’t expect. This new series will have a significant influence on their credibility as a network moving forward. If they don’t succeed they may fall too far behind Amazon and Netflix to be viable in the future.