The reason she won't be included, the only reason that matters, is that she lacks the Legendary aspect that Sakurai looks for in 3rd Parties. Sonic, Snake, and Mega Man are Giants of gaming. So much so that they were included in SSB even though Mega Man hasn't had a new game in ages and even though Sonic's games are declining in quality. Bayonetta is a legend in no facet of the word: she just doesn't have the right stuff. She's got the right stuff for fanboy erections, NSFW fanart and that faux, B-Movie "edginess" that comes from being an over-the-top, sexual-ized, Femme Fatale character type. But there are only a few characters deserving of a 3rd Party spot, and she just isn't one. The point of 3rd parties, yes, is to bring more fans from other games to Smash, but is not to do so haphazardly. Fans of Sonic, Mega Man and Snake grew up with these games and love these characters. Clearly, I'm not saying Bayonetta isn't a loved character, simply that she has only been around since 2009-2010 and 3-4 years is simply not enough time to garner the type of response or nostalgia that these other characters bring to the table. (I doubt that people were ever sitting around and they seriously asked, "Who would win a fight: Mario or Bayonetta?" That idea is stupid. However a competition between Sonic and Mario makes far more sense given their historic rivalry.) Someone like Pac-Man or Bomberman; gaming icons which are more deserving despite their failure to transition to the modern era. After them come lesser known 3rd parties that still have an avid sense of nostalgia about them: Geno, Lloyd, Crono, Crash, Simon Belmont, Spyro, Banjo, etc. The only more recent 3rd party with a chance would be Professor Layton because he's made quite a name for himself in the past few years. However, I suspect that there is only 1 (POSSIBLY 2) third party spot left in SSB4 and it may just go to Snake. Adding just anyone because they have a game on a Nintendo console would just seem like pandering and Nintendo isn't like that. (Would it make sense to add Edward Kenway, the Assassin from Assassin's Creed IV, just because he had a game on the Wii U? **** no.) If they did do that, they would lose my respect as a company.
It is fine to make a support topic for a character you don't believe can get into the game, but stop clinging to bits of useless information like they prove something: they don't. It's sick. It's dumb. And annoying. It's even annoyed the creator of Bayonetta. The only proof is the Dojo. I do think that if Bayonetta games keep getting made her popularity could reach a level where hoping for inclusion in Smash wouldn't be insane. I'd say maybe Smash 6. Until then discuss moveset possibilities, how she would fit in/stand out and what you like about her games. You can't wave theoretical release date info and clearly sarcastic tweets around like they're proof. It's dumb. As dumb as saying Pyrosphere destroy Ridley's chances as a playable character or that this long without a reveal that Ridley is a stage hazard proves he's playable. We literally know nothing. Deal with it.
That being said I have nothing against Bayonetta. And I would still buy SSB4 and play as her if she were playable. I also wanted to get Bayonetta but just sort of forget about it.