On the next generation non-Nintendo consoles, I can't imagine it not being shooters. On the X360, shooters accounted for 30% of the sales, going by the VGChartz definition of shooters. Which, for instance, doesn't include Mass Effect, which is a semi-shooter. Depending on how you define it, the number could be higher. On the Ps3, shooters were 22% of the sales. On the Wii, shooters are just under 4% of the total sales.
Sports games are also quite prominent on both, being 14% of the total sales on the X360, and 15% on the Ps3. Sports games were also quite big on the Wii, and if you include fitness games into the equation, they're actually 33% of the Wii's sales.
If you go by a broad definition of sports (which includes Zumba fitness and Wii Fit, for instance), Sports games actually sold more than shooters on consoles this generation, with some 430 million sold against roughly 390 million shooters.
Sports games are only likely to grow bigger (there's absolutely no reason for them to decrease), so I'd wager they'll outsize shooters next generation, possibly even without fitness games.
Platformers are leading the 8th gen so far, though, with 23% of the sales on the 3DS, 30% on the Wii U and 8% on the Vita. That obviously won't last, but it's still very nice.
Platformers actually sold over 212 million in the 7th gen, (84 million on the Wii, 77 million DS, 22 million Ps3, 18 million PsP, 11 million X360), so they're among the big-guys. Granted, nearly half the sales are Mario games, but that can be said for shooters too. Over a third of the shooters sold this generation are Call of Duty games.
For the 7th gen, role-playing games ended in between platformers and shooters, with just shy of 300 million sold. But again, 80 million of those are Pokemon games.
