Nah.
We already have smart phones. Apple has their IOS game line up, Android phones have there own. Don't forget Windows Phone (which my wife has) and we have plenty of mobile gaming already.
It's already bad enough with the Vita and 3DS on the market. I honestly wish it was just the 3DS left on the market, because with tablets and smart phones there are plenty of portable gaming options.
Between PC, Console, Tablet, Phones and Hand Held gaming I have enough games to last me till the day I die.
It's just that simple.