I can see this from Nintendo standpoint, they need some hot exclusives to promote the console and up till now all they had were some ports of slightly older games with just a few addons, and from the look of their marketing they are trying to approach the "core gamers" and move away from the "family oriented" or "children's toy" stigma they created (talk about that later).
Also we can can look on this from Platinum G. standpoint, they have a brand new hot IP that's not used since NO OTHER PUBLISHER is willing to invest in, why is that?, if one is finally showing interest then by any logical standpoint they should pursue it.
But now, here is what matters: THE GAMER / THE CONSUMER / THE FAN standpoint, say what you want about about the first game, it sold relatively well, not huge numbers but it was well received, you are either the IT'S AMAZING category or the IT'S SH1T category, let's not talk about them for now, lets focus on the FANS, the gamers who bought the game.
I personally got it for the PS3 right when the patch was released, I loved it I never thought or understood the so called backlash of the "inferior" port, it was a well made game, very fun and stylish, clocked in many hours on it, so I naturally want to play it on MY system, since I can only afford one. So how am I to react to an announcement that one of my favorite games of this generation will be an exclusive on a console that I have no prior investment in, a brand new one at that, unproven, playing the first game on MY console and becoming a fan of the series, can you blame me for presuming that I will continue to enjoy it on MY console, no, I must buy completely different one in order to prove my loyalty.
What is the point of creating a fanbase if you're just going to ignore it by turning a once multi-console game into an exclusive?
Granted, if Platinum G. was smart, they would have kept most of the right's for Bayonetta, since Nintendo is the publisher most would assume that it can never reach the other consoles, quite possible (just like the first Mass Effect), but if they played their cards right, they could have just agreed to a timed exclusive so if they could get a different publisher, that has more then 2 brain cells, and we might just get our 360 and ps3 versions (or 720 and ps4, witch ever comes first)and with a bit of luck a pc version too.
DON'T ALIENATE US, WE WANT TO PLAY IT, EXPAND YOUR FANBASE, NOT TRY TO REBUILD A DIFFERENT ONE AND RISK LOOSING THE FIRST ONE.