At this point, I see Dixie as comparable to the likes of Toad and Bandana Dee (a step or two above them, but still similar in premise). They might be potential "underrated" newcomers with whom to pad the final roster, but they're nowhere near as flashy as the fan favorites most people have wanted in since Brawl, regardless of whether a select few lump them in with Ridley/K. Rool/Palutena and then cry foul against all veteran series newcomers when they predictably miss out.
I do feel a bit of sympathy for Dixie in that, if she's playable, she's almost unconditionally going to get hate from portions of the fanbase. If she's in before K. Rool, she gets hate for that, if she's in at all as a semi-clone, the anti-clone fanatics jump all over that as well, and if she's in alongside K. Rool, you'll get dense people bashing them both and claiming that "DK DOESN'T DESERVE FOUR CHARACTERS!!!" It was hard enough for the arcade junkies to accept that DKC deserved content at all, after they had to be dragged, kicking and screaming, into accepting Diddy as anything more than "a stupid monkey" pre-Brawl.