Perhaps the OP could change the thread title to something a little more precise, such as 'Do You Agree That The PC Is Becoming Obsolete?' or something similar; perhaps the thread title is designed to tease and tantalise - who can resist such an open-ended question?
Anyway, no, I don't agree with the premise in the article. Indeed, two things occur to me when a topic such as this is posted, and phrased in such a way.
Obviously, the first is the - my - response to the question asked: No, PCs are not dead and have not exhausted their uses. Not everyone is cutting edge, and most offices and companies will be using this technology for some time, irrespective of what is happening in the private sphere.
The second observation I wish to make arises out of the zero sum attitude I see sometimes on this forum when such matters are raised.
Seriously, just because something marvellous, new, cutting-edge, socially revolutionary, technologically transformative is created, or developed, or invented, does not mean that the older forms are automatically obsolete and irrelevant.
One form of communication and technological change does not always invalidate what already exists. Sometimes, they continue to co-exist side by side. For example, radio has carved out new niches for itself at local levels, and continues to thrive alongside TV, and cloud computing.
Books and Kindles will continue to co-exist. The older technologies may face challenges (and may well have to adapt to changing circumstances), but many of them will continue to co-exist. And new technologies will not supplant them until they have proven that they are easier to use, and generally somewhat better than that which they seek to replace.