It seems Victini is not down for the count yet; there is a new event for it in Japan to celebrate Christmas.
This particular Victini, like a previous one, knows signature moves of Reshiram and Zekrom. However, the moves for this one are the other signature moves; Blue Flare and Bolt Strike. It will also know V-Create as well as normal Kyurem's signature move, Glaciate.
I doubt one event will do anything for Victini's chances, especially since this event seems no more special or important than any other Pokemon event. Plus Pokemon like Cubchoo, Pidove, and Scraggy have had events, so events don't necessarily signify great importance anyway. Not to say Victini is only at the level of those three, it is still obviously one of the more popular and marketed Pokemon this generation, but this honestly does very little, if anything, for Victini's chances.
B-K isn't even really all that Nintendo-like anyway. He really has a small history with it, being omitted from the remake of DKR. I wouldn't give him much of a Nintendo status. Killer Instinct had Nintendo Status, at the very least, though. All the games were that and Arcade, same with the Mario/DK Arcade games.
I'm quite confused at to why Killer Instinct has "Nintendo Status" when B&K do not. Sure, neither of them do anymore, but at one point both did, it was never one and not the other. Just because Microsoft has yet to do something with KI, doesn't mean it's retained its Nintendo status, the IP is fully owned by Microsoft.
Also, while subjective, I'm sure the majority of people would agree that B&K is much more Nintendo-oriented than Killer Instinct. There's a reason why B&K are the most clamored for IP to return to Nintendo, and why Banjo & Kazooie are the most requested Rare character for Smash.
Lastly, Killer Instinct and B&K have pretty much the same status in Nintendo's history: two main games developed by Rare and published by Nintendo, both owned by Rare and bought by Microsoft. Plus Banjo had three more appearances on Nintendo's systems than any KI character did.
As for Banjo being ommited from DKR... I don't even know where you're getting the idea that he was going to be in it to begin with. He's owned by M$. There is NO chance of him getting in as he's owned by a rival 1st party company. The Banjo games we got on the GBA were because those contracts had already been made by Rare before the buyover, the development was simply passed on to THQ.
I agree with pretty much everything you said, but Rare and Microsoft don't have a problem with making games for Nintendo's portables, as Microsoft has no portable to compete with Nintendo, so technically B&K, Conker, KI, or any Rare IP could still show up on a Nintendo portable (like Viva Pinata did). If Microsoft really had a problem with Rare working with Nintendo, they wouldn't have allowed them to developed DKRDS anyway. The most likely reason why Banjo and Conker weren't there was because of licensing costs.
There were also those rumors a while back about Rare suggesting DKC4 or B-K for DS to Nintendo, but Nintendo choosing for them to remake DKR instead (which, if true, is upsetting).
http://gonintendo.com/?mode=viewstory&id=178950
Plus this could also apply to Banjo in Smash 4, there's pretty much no chance of him appearing on the 3DS version whatsoever, but it's not technically impossible, unlike appearing on the Wii U.