Cutting Sheik because of some arbitrary view of the roster without thinking about 20+ years of Smash is the single most insular speculation thing I have seen yet. Smash is never truly going to go to a “foundational” level given we have 25 years almost of Smash at this point. It’s a fringe at best view and is exponentially unlikely. Literally the only way sheik is going to be in any remote danger of a cut is a hardcore reboot of smash, which I think is just a speculation dream. Nintendo doesn’t broadly mess with the formula, especially when this smash sold more than Brawl and Melee combined easily.
I also find it hilarious that people complain about Zelda representation, yet are still whining that we should cut one of the few unique Zelda characters we have to give that moveset to someone else. The roster will never be a perfect picture of representation you expect. Sure, if smash was made from the ground up today, sheik might not be there. Neither would plenty of Brawl and before characters. Would Earthbound be a priority without Smash helping add interest? Would Falcon have any strong chance with the state of F Zero? What if Kid Icarus never got its remake due to Brawl? Sure, if smash went to some “fundamental level” things could be different. That’s not gonna happen. The genie is out of the bottle. Smash Ultimate was the best selling fighting game ever. They are not going to hard reboot things. Even if they were, the niche fringe at best views that are on here would not be how they reboot it in the slightest.
Please don't characterize people's arguments as "whining" unless you can be more specific about the posts/statements in question; otherwise, it does nothing but artificially undermine those arguments and, at worst, provoke discussion into becoming unnecessarily emotionally charged.
Also, you have in the past accused me of this "fear mongering" thing, and while I am totally fine with chalking that up to misunderstanding and letting it go, what you're doing here seems to be just that from my perspective (although I don't claim that was your intention).
Like, people bring up the idea of cutting this one, singular character for very specific reasonings which pertain equally specifically to that one, singular character. And somehow that gets blown up into complete removals of multiple first party franchises, some of which even have secondary reps which could be cut without uprooting the whole series.
And yes, what's done is done: EB, KI, and F-Zero have indeed benefitted greatly from the visibility that comes with Smash playability. It'd be nice if the list of such series was even longer than it is. But these are also classic franchises whose importance and impact on the Nintendo community at large go well past just being featured in Smash, even if Smash has helped to motivate that impact and bring it to the public eye. What people are saying is not simply that Smash has made Sheik more visible than she otherwise would be, but that Sheik lacks the impact on OoT or the Zelda series overall which would justify those benefits (even after having received those benefits for years).
Besides, auxiliary, non-core characters like Sheik are simply much easier to cut than primary reps even for smaller franchises, especially when there are superior same-franchise options in place of the former. And while we're speaking of auxiliary reps, don't forget that EB and KI in particular having a second rep makes it vastly likelier that they will stay on the roster in some capacity.
In short, I seriously doubt they will prioritize removal of entire 1P franchises, especially two-plus-rep franchises. And, even if it came to having to remove whole 1P franchises, then certainly the likes of Ice Climber and Gyromite would be at much higher risk.
Lastly, it's not contradictory at all that a unique Zelda rep is being targeted: Sheik being unique is not among the reasons people are thinking she could/should be cut, and it's not like the non-unique existing Zelda reps aren't subject to scrutiny as well. Sheik being unique isn't the issue, and more uniqueness isn't people's only consideration in constructing a satisfactory Zelda roster.