and? There are several amiibos that have little brand appeal, but that doesn't stop fans from collecting all of the line.
The key aspect to remember is that there has to be something to pull the initial weight. The less known figurines from the various amiibo waves benefited from the brand power of the most popular IPs, plus the appeal of the Super Smash Bros. series itself. So the argument will inevitably lead back to PSABR and that doesn't make a good case for Sony.
If this type of thing were to happen, they'd launch Sony IPs alongside some of their better known characters (Cloud, Crash, Snake, etc.) to pull that initial weight. At least, that's the only feasible way in my mind. That and some actually worthwhile game interaction (which is debateable with the amiibos).