I tried to go for a long time with a Mac mini as my main computer, an iPad as my portable computer, and iPhone as my pocket computer. (Later added the Apple Watch as my wrist computer.)
Recently, the Mac mini started holding me back on some of the more high powered things I was trying to do with it. I also noticed that the iPad Air was sitting in my backpack more and more and only being used for Netflix about 3 times a week. Most times when I needed a portable computer, I was going to my iPhone 6 and neglecting to even think about the iPad. I tried getting a keyboard case and using it with iOS 9 beta for awhile to see if it could serve better as a makeshift laptop, and I was SORELY disappointed by the combination of iOS and a keyboard for productivity.
I am a HUGE fan of all things Apple, but I finally had to admit that the iPad was just not my thing anymore. It wasn't powerful enough to be my main computer (much like my Mac mini) and it wasn't convenient enough to choose over my iPhone. In fact, if I had to choose between leaving the house without my Apple Watch or leaving the house without my iPad, I'd leave the iPad at home every single time.
What I eventually did was sell the Mac mini AND the iPad Air, and get a 13" rMBP instead. For me, it has been a wonderful mix of power and portability with no compromises in hardware or software. Haven't missed my iPad for a second.
What I saw today with the iPad Pro did not change my mind at all. It's still iOS trying to be a computer, and it's still really just a tablet with a keyboard case. I do realize this is just Apple trying to shake things up a bit, but there is pretty good evidence now that most tablet users just use their tablets for Netflix and Facebook. I'm rooting for the iPad Pro, and I hope it takes hold in enterprise the way they want it to, but I just don't think tablets are the way of the future anymore.