From a review standpoint, Apple will accept your app provided that the functionality you have implemented already is functional and free of obvious bugs. Assuming you've achieved that, then this becomes a business question. You've made some assumptions in creating your app about what users want. Is it better to get the app out to real users and find out if those assumptions are correct? Or would you rather make sure your assumptions are really polished even if they might be wrong? To me, the question is rhetorical.