I agree. I was thinking about the exact same thing lately.Not sure when it's coming but it seems to be in the plans.
http://www.gamesindustry.biz/articles/2014-11-18-sony-wii-a-shadow-of-its-former-self
It does seem that the casual market is up for grabs on the Console side right now with no clear path of what console to buy for casual games because Wii U made the Wiimote secondary & Xbox One removed Kinect from the standard package. Seems that either one of the big 3 could go after that market as the prices come down on the consoles Xbox One is losing ground as more Xbox One consoles are being sole without Kinect & the price to get it standalone is $149 so it will be a harder sell than something like a Wiimote/PS4 Camera pack-in game for $50 or $60. PS4 could even be repackaged to include the camera at $399 next year just to establish the PS4 as a casual console.
The casual market is already familiar with the wand. The body motion tracking experience of Kinect came with a bang and left with a whimper.
Packing a motion controller and having a nice collection of casual Sports/Party/Family games pre-installed in every console would have done wonders. No need for extra packaging costs. The PS4 would have been casual fan/party ready for everyone and a word of mouth would have been initiated even by owners who arent casuals. Someone else in the family/relationship/friend would try it out. They dont need to go too expensive with these games either. They are simpler in nature than a huge immersive hardcore AAA title that require millions to finish. The motion controller fills the gaps of immersion easily for the casual people. If this works they will easily cover the costs of these free games
The DS4 controller itself is a motion control device. But I am not sure if the form factor of the DS4 would work. A wand like controller is easier to convince due to form