Phantom 3 would be also compatible with various industrial applications, if originally promised features will become available. However, Inspire, Phantom and Matrice are very different quadcopters in my opinion, and you have to choose carefully which one will suit your purpose better.
Also DJI is taking Apple path, it's very clear, as the product complement each other.
Remember the Iphone / Ipad debate ? Why you should buy an Ipad if you have an iPhone, or why you should have an iPad if you have a Mac ?
Now almost everyone owns all three of them, at least I do and each one of them has a specific role in my activity.
The same with this three drones.
For a serious aerial UAV company, this trio covers almost every angle in UAV industry (I believe it's just a matter of days/months until new options like thermal imaging, new gimbals will become available.)
Bottom line, I am looking forward to my first Matrice flight