What is a Motorola 360? I have never ever seen one in use, nor a Sammy gear or a google glass for that matter. I guarantee that when apple sells 10 million iwatchrd the first year, we will all see them everywhere. And yes, I know what a moto 360 is, I'm just proving a point. Also, nobody knows what the iwatch will look like.
I have no idea how successful the iwatch will be, what I do know, it is already a long way from being perceived as being first. It is not walking into a market which has years of necessary frand patents. It is walking into a market with large companies Sony; Samsung; Google already having products(some on their second generation) and patents. Whatever the iwatch looks like they changed the game...and it is costing them now. Oh and I like the look of the Motorola 360 too, so its looking pretty good for an unlauched product.
Take a wander back to the first generation iPod, or the first iPhone. Apple did not invent those device classes.... they innovated them. They refined them.
Small innovative MP3 players had been around for years before the iPod came out... iRiver had some of the best ones available at the time, and they went far beyond what the iPod started out as. But the innovation was embedding a mass storage device, and a well thought out user interface, and having a relatively seamless process to load media onto the device, and creating a media market place to reduce friction in media sales, and really great marketing and advertising....
Same thing with the iPhone. It wasn't the first smart phone.... it was the first rational smart phone. The first with a sensible UX story. The first with seamless media integration.
All of this evolved EVERYONES expectations of what a smart phone could be and ultimately SHOULD be.
As others have pointed out Apple did not invent the GUI even before XEROX there were bold steps in that direction that simply fell flat... Even the LISA... the first Apple attempt at what became the Macintosh was a bloated piece of crap. Apple didn't invent the laptop either. Their first attempt was the Macintosh Portable... IBM Selectrics weigh less and take up less desk space.... forget about using it on your lap... your legs would go to sleep before you got the thing to boot. Their second attempt in each case was full of win.... Mac 128K took off.... and in its time so did the PowerBook 100... the first practical laptop by any manufacturer.