I'm not really sure what to make of that. On one hand, yes, more and more things are being done in browsers, and possibly on phones, which in theory de-emphasizes the importance of x86 and Windows.
On the other hand, especially when it comes to laptop market share diminishing, I don't even know how many times and over how many years I've heard people say that laptops will become obsolete because of phones.
Hasn't happened, at least for people who use their devices for almost any kind of work. For finding a repair shop for whatever you need repaired? Sure, most people will probably use their phone for that, and people who only need an internet device for things like that might not bother with more than a phone. Writing a report or a plan? Not so much.
I honestly don't think the market for laptops is going to diminish that much when jobs become more and more white-collar.
With Apple's non-negligible market share and their using a different CPU architecture, combined with the emphasis on web and browsers, x86 will probably become less of a de facto standard. But it would take a lot to topple the inertia of Windows in the consumer on non-tech work market.