Not replying to anyone in particular, just giving general thoughts. We could have the textbook definition of "closure" given to us by Sakurai himself during a presentation, and it still wouldn't get through to anyone that has closed off their views/mind on a specific thing happening in the specific way that they specifically imagined it at that specific time.
Whether you choose to prepare for the worst or ONLY set yourself up for what you personally consider the "acceptable outcome" means very little over the course of speculation for this series. There are countless anecdotal examples of why you should(n't) do this, why you never say never, and why just because you try hard doesn't mean you'll make it in.
It goes without saying that no vocal minority, no matter how loud they may be, speaks for everyone. Most, if not all the events that come to pass (that a large majority of fanbases take part in at least some small capacity, and either complain about or praise constantly lest they forget about after bringing it up the one time) are a result of cycles repeating themselves. We've gone through the hypothetical "oh they totally wouldn't do this" Versus "they absolutely can't forsake ____" each day for years.
So what's the point after so long?
Primarily, we have very little to do other than think of what-ifs, why-nots, etc. while we have basically no other control but to wait and see what ultimately ends up happening. If you care enough to be on a forum, social media, or some other form of "support" group for a thing that in the grand scheme seems highly inconsequential, well there you go. There's as much point to getting mad/laughing whether you/someone were right/wrong as there is in having read this post, the post above, or the post over there. Although that one post was pretty worth, imo.
As a little disclaimer/food for thought, I don't think any of the recent trends will mean anything once we get to the next milestone. I could easily see more assist trophy-costume transitions as well as I could see returning ones still be suspiciously missing until the very end for a largely negligible reason ("What does it mean? We dunno, we honestly didn't think that hard about it").
What is fun for me now is imagining what ****shows future speculation will be wondering how likely things like costumes mean for future "upgrades" (if assist trophies are even a thing past this game, and not replaced with some kind of incredibly convoluted gimmick that Sakurai's cyborg successor perfected in order to appease the 90/10 casual fan split that the "core" side swears doesn't exist) while also knowing I'll just be happy in a few days seeing Bomberman bonk Dracula on the head anyway.