Honestly, there's Casual, there's Hardcore, and there's about 60 degrees inbetween. I'd say it's on a scale of 1-5, 1 being super casual and 5 being super hardcore. Most people that are accused of being casual are 2.
But despite that, it's not about being irrelevant NOW, it's being being irrelevant TOMORROW. Microsoft and Sony's shit isn't going to last into the next generation. But Nintendo? Yeah. It'll last.