The iPad is here to stay.
I had a first-generation iPad, courtesy of my employer, and I concluded, then, that the device was "useful" but completely rubbish at the same time. Back then, the only channel to and from the device was iTunes and the concept of creating any sort of content on it was laughable. Roll forward to this year when I experienced the iPad pro (second generation) for the first time and the situation cannot be more different.
Today, my iPad pro and my phone are the only devices that I carry with me when I travel.
I am a software architect and the concept of coding on the iPad is ridiculous but, frankly, I absolutely loath coding on the run or on the factory floor and so I have no problem with this limitation. Instead, the iPad lets me draw sketches and diagrams and ideas and lob those over the fence in the direction of my dev. PC back in the office. That's a far more productive use of my time than hunching over a greasy coffee table, trying to hack out lines on a tiny notebook monitor and inadequate keyboard.
The iPad serves for communication, entertainment and more, too. I would never give up my beefy desktop workstation for it but it has already replaced my laptop and I am happy with the result. It also means that I can leave my Kindle at home without suffering the reading experience of a phone screen.
After the first generation, I thought that the iPad would whither and die if it did not evolve quickly. Apple have successfully effected the necessary evolution.
Disclaimer: my beefy workstation runs Windows and my phone runs Android; don't count me among the ranks of Apple loyalists. Also, don't even get me started on the topics of Windows 10, the Android platform and bloat and Android hardware disparity, diversity and quality.