I wouldn't think Sony fans are as young (at heart) as the Nintendo fans. Because I don't see the appeal in a Mario, or Kratos Amiibo. Other people would, and do, of course, but what I'm saying is that Amiibo is for family-friendly type stuff. So, Kratos, and most of the PSAS cast wouldn't be so great as figures. But, some characters, like Parappa could work.
But, you'd be after a demographic that nintendo already has. And, those same people would have to not be anti-sony and I've met a few nintendo people over the years who are just that.
So, no... I don't see it working. People who are interested are on nintendo, for the most part, and the amiibo doesn't fall in line with the PS3, PS4, Xbox One's main demographic.