This is hardly surprising. Platformers have always been Nintendo's franchise. To date, only one Nintendo platform had less than 10% of its sales from platformers (the Gamecube), and not a single non-Nintendo machine has had even 7%, although the PsP got very close.
You can call platforming dead on the Ps3, but the Ps3 is selling equally many platformers as all non-Nintendo machines ever have.
Note that the older machines might have slightly lacking data, so they're probably a tiny bit higher than represented here. The percentages are the percentage of total software sales that are platformers. The total software sales were found here: http://gamrfeed.vgchartz.com/story/81136/big-three-shipment-update-forecasts-through-june-2010/ , except for the current generation machines which are just sold to date.
Gameboy Gameboy Colour: 66.4 million (13%)
Gameboy Advance: 51.5 million (13.5%)
Nintendo DS: 67.9 million (10.5%)
Playstation Portable: 14 million (7%)
Nintendo Entertainment System: 90.1 million (18%)
Super Nintendo Entertainment System: 65.7 million (16.5%)
Sega Genesis: 14.04 million (Roughly 3.5% )
Playstation 1: 47 million (5%)
Nintendo 64: 34.2 million (15%)
Saturn: 0.83 million (No idea)
Playstation 2: 44.15 million (3%)
Gamecube: 15.7 million (8%)
Xbox: 6 million (3%)
Wii: 64.6 million (10.5%)
Ps3: 11.72 million (3.33%)
X360: 9 million (2%)
