Think your best hope is that the guys who founded Rare (cant remember their names) form a new company and manage to gather together some decent staff and start off all over again. Might not get you Banjo or Killer Instinct but could get you some new IPs that are on par with them.

I think the two guys that founded Rare were Tim and Chris Stamper though i have no idea what they are both up to now.

Honestly I remember Rare hinting before E3 about a new title. I was so excited and the email given on the site was like Banjo@Rare or something like that. I remember everyone thinking Rare had another Banjo title in the works. Then E3 happens and Kinect Sports is revealed to be Rare's big announcement, arrg I was so dissapointed and pissed off.

Will Rare ever make a good platformer again? Banjo , Conker? I hope so but given the studio's current capabilities a decent showing is unlikely. Since Microsoft lost the Stamper Brothers and most of the studio's master minds they need fresh blood get some new people and build on the existing AAA IP's!

have you played nuts and bolts?

Yes and it was awful. I mean it would have been alright had it been a new IP. But using Banjo's IP was just wrong the game didn't feel at all like Banjo. Rare screwed the IP up big time with that junk, even they knew it was bad when they launched it at a budget price!

One of the key staff involved in Goldeneye founded his own team called Zoonami, they made a game called Bonsai Barber.  It was better than anything Rare has created since Starfox Adventures

Banjo Kinect!!! - Where YOU do the platforming!

Rare turned stupid

Kameo isn't very good, I played it for like an hour before the transformation novelty and the boring puzzles started rubbing me the wrong way. Nut's & Bolts is a much better game and if your looking for a platformer fix, then I recommend Ratchet & Clank: A Crack in Time (It's the best in the series and the most platformery). Otherwise look out for the Sly Collection, those three games are meant to be really good.