Well, if by red ocean, you mean games that involve a lot of blood, Nintendo never had that market, except, quite disputably, with the N64.
If you're talking about their "core" market, then I think the change in sales of a staple Nintendo series such as Mario Kart from GC to Wii or DS would be a great measurement of how much Nintendo has lost and failed to expand this audience.
“These are my principles; if you don’t like them, I have others.” – Groucho Marx







