Remathilis
Legend
I hate quoting people no longer in the conversation, but...I think it bears repeating that thus far, only one person has expressed a specific reason to be resistant to the idea that this a new edition.
@Remathilis point about not wanting to start all over again is a good argument for not wanting this to be a new edition, but the things he points out are things I think are just missteps, and why I suggested the update-and-consolidate box. Instead of making people wait for things to be republished, roll them into the core game, that way, if nothing else, any future supplements will be genuinely brand new rather than rehashes of old content that should have just been core.
Plus, has to be said WOTC is already violating this by not including the Artificer as a core class, and I wouldn't be surprised if theres other examples.
5e has plenty of books I don't want to rebuy. Modules I've yet to run like Witchlight. Settings like Planescape. I still want to use Mordenkainen races and monsters. I'm STILL patiently waiting for things that existed in 4e and older to return. I don't want to convert things over again. I just want 5e druids to be less of a pain to play. 5e is a generally good system, and I find the changes they have proposed have ranged from "thank Pelor" to "eh, not what I'd have done..." But no explicit deal breakers. So for me, a new set of 5e books that fix some of the problems with 5e is preferred to a wildly different 6e. I can convert something pre-24 a helluva lot easier than I can something from 4e or earlier and I have most of the stuff I need (if not all the stuff I want) currently.