There really is a huge hole, and one that's there to capitalise on.
It makes sense actually, how the likes of Waverace and Excitebike kinda disappeared into Wii Sports, and F-Zero into Mario Kart. It does show they are very much lacking confidence in those brands, which could very much be a cultural thing.
It's the Western Market Nintendo really need to win back with their next console and coming out of the gates with a host of Sports Titles could very well be a good strategy if they have the vision and guts to go for it.
There's no real reason they couldn't captivate the sports crowd, and win back the likes of Tony Hawks, Fifa and Tiger Woods to complement it perfectly.
Honestly what else is there? There's that Extreme sports title coming from EA (which arguably Nintendo should have given them no reason to make), and there's Motorstorm, which we haven't seen from yet.