It's attitudes/perceptions/approaches like what is being discussed here that, imo, makes WotC shy away from existing settings. For some, anything less than a reprint of the 2E settings will be unacceptable. For others they will want varying degrees from just a bunch of new locations and additions to the D&D they already know. But whatever DS 5E is (if it ever gets published) it WILL alienate some fans.
What WotC will have to do is decide, can they come up with something that will attract more new players than the old players who they will alienate. Of course, they also stop and say a totally new setting can accomplish the goal of gaining new players, giving existing players more to purchase, AND not alienate any fans of a given setting.
So, saying that DS 5E "has to have this", or "must be this" just makes it less likely that such a thing will ever come to be. For those who say "must this" or "can't be that", just do what 'we' have always done, make your own version. You probably are not going to be happy with anything official anyway. For those who can accept a new version of something loved for what it is, then encourage a 5E DS and love it for what it is, not for what it isn't.