I'm not so sure that Nintendo should listen to what shareholders want. They're all about the short-term profit, whereas Nintendo have to think about how to sustain their business for the long run. Shareholders wouldn't care if Nintendo went out of business tomorrow if they made money today. I'm not really sure what that smart devices comment could mean, as the handheld space isn't where Nintendo is having a problem. The 3DS is doing really well, and so are its games sales. If they think it's under-performing simply because it hasn't sold as well as the DS, it's too high a bar to shoot for the best-selling system in all history. I hope they don't do anything stupid to mess up the good thing they got going with the 3DS because they tried to make it sell like the DS.
As for the Wii U, I'm reminded of a quote I saw in another forum thread about the GameCube: “We are a very small game company. We do not have the resources of these others.” Nintendo can't compete with the tech giants of MS and Sony, they may have created a war chest from the huge profits of the Wii and DS, but they still can't afford to create a beefy system and sell it at a premium price for such extreme losses. Further, I don't see a point in doing that either. Why have three systems on the market that are all essentially the same thing? Heck, we had four during Gen VI (DC, PS2, Xbox, GCN), and it felt completely pointless to me. Nintendo should continue to create their own brand of system like they have with the Wii, Wii U, DS, and 3DS, they just need to find the right thing. For this gen though, their best bet for the long term is to just continue trying to make the Wii U a success. Any other drastic choice is too risky for their small company.