In reality a phone these days is only barely a phone. The ‘phone’ part was a brilliant marketing ploy. After all, how many people would queue outside stores to buy a ‘personal pocket computer’? Then came the Watch. What next?
The problems with the Leap Motion Controller are the problems that bedevil all really new things: we’re unfamiliar with them and their niche hasn’t yet been clearly delineated. The clearest benefit may be for those who work in 3D: surgeons, sculptors, architects, gamers.