Actually. It's because the 3ds appeal to small child that it is not as doom as the vita. Parents are more likely to buy a 3ds to their children than a smartphone. Also grown up people have smartphones so they are less likely to buy a vita to play on the go.
But we must first concentrate ourselves on the way to entertain people, for video games to live. Else, it's a world where sales representative will win, which has as effect to kill creativity. I want to say to the creators all around the world:"Courage, Dare!". Shigeru Miyamoto.