You have to look at context as far as character requests go. Tom Nook emerged as the supported choice for an Animal Crossing character after Sakurai deemed the series 'too peaceful.' As to why that happened, Tom Nook is, in the Internet's eyes, an antagonistic meme. To them, he's the furthest thing from 'peaceful' in the series, and thus, represented one last hope for an Animal Crossing Congressional Rep, despite not being the face of Animal Crossing like the Villager. This was, of course, when people thought Sakurai's judgment was absolute.
However, since Sakurai looked past his previous reservations, he added in the more iconic Villager, and through his various props, made him a playable representation of the series as a whole. Nook is superfluous in that regard; two prop-swinging cutesy newcomers from the same series isn't a probable outcome, no matter how loudly his fans moan that he should be considered with Ridley and K. Rool and we'll definitely see him Tuesday.