If you want the DS and Wii to be risks, fine, but I would point out when these risks occurred: last console generation, when Nintendo was struggling in 3rd place and desperate to make something that was a hit. That was also the Nintendo that allowed a Western Studio to bring Metroid into 3D First-Person Gameplay; gave us a Mario game where the primary game mechanic was a squirt gun; turned Zelda into a cel shaded, sea-faring, cartoon adventure despite a very public outcry; and gave us Miyamoto's 1st new IP since the NES days. That was a completely different Nintendo than the one we have now, flush with DS and Wii money and now very reluctant to take big risks for potentially big gains. Today's Nintendo plays it safe because there is no longer an economic imperative to push the boundaries and try new things. Instead, we get incremental upgrades and nostalgia-placating.
In many ways, I almost wish Nintendo was on the brink of irrelevance once again, just so they would feel the need to push their boundaries and do new things that surprise me. I never feel positively surprised by anything Nintendo does anymore (the Nobunaga-Pokemon crossover nonwithstanding), and I miss that feeling of excitement when Nintendo is truly being creative. These days, it's more exasperation at Nintendo doing X thing in Y game despite it not being the best way to execute a particular idea. "Desperation is the Mother of All Invention", indeed.