While cloud computing has many merits, there is no way I'm going to trust being able to get online every time I need to work on my computer. Especially being a laptop, it is meant to be taken places, not chained to an internet connection like a desktop computer. So if I want to take it outside, or to a beach or even on a boat in the middle of nowhere, or anywhere in the middle of nowhere for that matter, it will be a reminder that I bought a portable laptop that can't be carried everywhere. Sure, there are always more hotspots opening up, but they do not cover large areas, and many are password protected, so I'd find myself carrying as you say in the article, a paper weight.
I could see getting a desktop unit that is connected to an always-on internet feed, but even those can stop working for any number of reasons, whereas a computer with local storage and local apps would just keep chugging along even in a blackout, the laptop due to its built-in battery and both laptops and desktops with the aid of a UPS power supply.
The alternative? The traditional desktop, laptop, cellphone or now tablets. They will all work with cloud computing if that makes sense, (collaboration for example), but there is a whole world full of opportunities and capabilities that will outshine the cloud computing paradigm by offering more options for apps, backups, not to mention speed.
Cloud computing will never match local computing for speed and storage. You can easily add more local storage, whether hard drives or flash storage, and you are not limited by internet congestion or distance from your wifi or other hotspot.
Other than the above, I have absolutely no issues with a computer that is limited to cloud computing. Go for it if it floats your boat, but just don't try to sail away from the dock.