They need to take risks because Sony has beaten them like a red headed step child in the console business for the better part of two straight decades. Lets give some credit where credit is due.
They are forced into taking risks because they have been beaten that badly.
To be honest, which Nintendo games on the last 10 years are even industry leading? EAD Tokyo is doing great work and they deserve props, the two Mario Galaxy games are probably the best Nintendo games of the last decade, Splatoon was a bold move, but aside from that ... there's a lot of good games, but not neccessarily industry defining stuff any more. Skyward Sword was not the best quest/adventure game for example.
This is not like the 90s where basically every year Nintendo either had the Game of the Year or a big candidate for GOTY (1990- Mario 3, 1991 - Super Mario World, 1992 - Super Mario Kart or Zelda: LttP, 1993 - Star Fox, 1994 - DKC or Super Metroid, 1995 - Yoshi's Island or Earthbound, 1996 - Mario 64, 1997 - GoldenEye, 1998 - Zelda: OoT, 1999 - kinda of a poor year, 2000 - Zelda: Majora's Mask or Perfect Dark), in those days Nintendo along with Rare were in a top tier class, nowadays they're still good, but they're not driving/influencing the industry anywhere near the same level.
So the idea that they know "fun" and no one else in the industry does is something I just don't buy.
So let me get this straight. Nintendo beats Sony's ass in handhelds, Sony caves in like a broken little child and quits. Sony beats Nintendo in home consoles for two generations, Nintendo comes up with new, unique way to play games (Wii) and not only competes, but beat's them handedly.
Right there tells you all you need to know about the two companies. One is a business. The other is a business with ideals, core beliefs and an overall philosophy.