They were never a sucess in the first place because ps360 still sold more in the end of the day

So for something to be successful it has to sell more than 2 consoles combined?

Gotcha!

This. Motion controls are everywhere these days. It's the waggle that disappeared (and for good reasons).

I personally enjoy playing Splatoon using the motion controls for aiming.

I think the key problem was that unlike shoulder buttons, analog sticks, online play, and so on, motion controls often came at the cost of other features.

So far, the main successful motion control options have been the Wii Remote, Kinect, and things like gyroscopes incorporated into hardware and traditional controllers.

The Wii Remote was great IMO, especially with Motion Plus, but it lacked input options like a second analog stick and many of the other buttons one found on other controllers. Even if we say pointing with the Wiimote makes up for the lack of a second analog, the Wii setup includes less buttons, often in places that are inconvenient, and a D Pad that can't be used along with the 1/2 buttons or the nunchuck. So even had the Wii been more powerful hardware, porting certain games would have been a problem.

Kinect didn't remove the basic controller, but it cost far more than the Wiimote. While your typical controller nowadays in the United States might cost $40 or $50 compared to the $60 Wiimote/Nunchuck combo, the Kinect on the 360 cost $150 on both the 360 and X1. And that was on top of the existing regular controller, meaning it's directly adding $150 to the price of entry.

Note that the last form of motion controls, incorporating them into regular controllers, was a complete success. Most platforms include or allow for this. And because of the lower cost and unobtrusive method, few people mind.

We have new Wii Fit, Mario & Sonic, rebooted Wii Sports, Kinect Sports, Wii Party this gen though. All these games were sales dud's in terms of massive drop-offs from last gen. Nintendo Land also had extensive use of the motion controller and that couldn't carry the Wii U for even a couple of months.

That's indicative of a fad, they should have solid sales across the board if there was a huge demand for these types of games. Just like Guitar Hero today is going to sell nowhere near the peak Guitar Hero games. Fad's come and go. 

That's not at all like not getting a new 2D Mario for two generations.

There's no market need for waggle games, the appeal in the first place was that it allowed people who couldn't play games to join in and play, but now iOS/Google Play had thousands of free dumbed down experiences for that crowd available anywhere. So that market need is taken care of.

Leaving waggle gaming exposed for the shallow experience it always was. Attempts to make "deeper games" with the concept really don't fly either because it's just not well suited for long play sessions. There's really not a huge groundswell of support to include motion controls in the new Zelda for example, because most core gamers are happy to play without it. 

Because Nintendo decided to abandon their most popular control scheme of all time and focus on the gamepad instead. Welcome to the real world: Motion controls were never "a fad", people loved the Wiimote. I've been asked so many times why the Wii U doesn't use motion controls anymore by friends who owned a Wii (and yes, I know you can connect a Wiimote).

Motion controls are as much "a fad" that people "tired from" as 2D Mario was.

motion controls were a fad. If not, people would have moved on to the kinect. Given the kinect's removal from the xbox one, motion control is no longer what it used to be. AKA a fad

Kinect is very different from the Wiimote. Motion controls are not a fad. People want motion controls, Wiimote style. They just don't have any products to buy that are built around them. 

Nah they a fad. No one likes wiimotes. Except for certain sports games like Tennis and Golf. That's why the Wii fad has died. VR will probably fail too cos most people just wanna sit back, chill and blow the fuck outs things aka COD

Playstation move also didn't take of. And that was very similar to the wii remote.

Most people are done with motion control. Wii sports HD is a HUGE farcry sales wise from the original. VR may very well be the next fad to pop up, but I gaurantee that motion control is no longer as wanted as you think it is.

Most companies know this. This is why Ubisoft shifted their focus from raving rabbids and just dance to assassins creed and far cry. Activision shifted from guitar hero to call of duty and destiny. This transition happened toward the end of last gen, where the wii heavily declined and the xbox and ps3 made huge comebacks.