So we can test the hypothesis using the Bieber method as proposed above. Make haste!
As for the Pluto 'controversy', science isn't science if we start making exceptions. If Pluto is a planet then so is Eris for certain, and it becomes an exercise in arbitrary hairsplitting to exclude Chiron, Ceres, Haumea, Makemake, Sedna, and Orcus, as well as an unknown number of other largish Oort cloud members. It is more useful to give these smaller icy bodies their own category.