Even if it a separate website or not, as long as it is created by the same team, I think it would still be amazing.
How can you be so sure? I do recognize the experience of the Stake team and it is possible that they can add something amazing here, but it is also possible that it might not be a big hit which is why it would be wise to keep your expectations grounded.
People are expecting it to be a big hit because as we know both Stake and Primedice have a big community and they are two of the most trusted websites meaning they will attract lots of people to join their sportsbook instead of other existing out there. Personally I don't expect it to be something big,at least not at the beginning since I'm assuming their team doesn't have a lot of experience with sports betting sites. Overtime I'm sure they will grow more and more, starting to gain more users and become a top website.