I don't think single player or local co-op games are even close to dead. Mario Kart has online, but the biggest draw is the couch co-op. The best selling single single platform game this gen so far (NSMBU) has been Couch Co-op. By that I mean Watch Dogs has sold more copies, but no single platform's sales of Watch Dogs have outsold NSMBU, Nintendo Land, or (soon) MK8.
We're just one generation removed from Couch Co-op being king thanks to casuals, and they could come back if the Wii U receives games that capture the same style.







