Yep. The last thing Nintendo should do is just follow market trends. That's a surefire way for them to collapse.
Nintendo don't need to emulate what Sony and MS do, or what mobile does. They are far more likely to find success again if they find something new and unique than just put out a third x86 box with nothing special except it having Nintendo developed titles.
Another thing people continue to do is equate the success of the Wii U to the success of Nintendo, completely ignoring the success of the 3DS. The 3DS has done really well, especially considering the fact that it's fighting the behemoth that is the mobile market.
Yet despite that, Nintendo has managed to sell multiple games with 8 digit sales figures on that one device.
Due to the ignoring of the 3DS's success, people keep going on as if Nintendo has zero mindshare. Kids do buy Mario merchandise. They know Mario, they like Mario. Same with Pokémon.