I'm genuinely very sorry for missing this comment (9 hours ago as I write this) because I think it's a really important and interesting next area of development. Since this article is still front page though, I hope I'm not too late to have some discussion here particularly since none of the other replies have taken the analysis approach I do.

If we're trying to predict the future, I think one effective approach to try to not be trapped in the present paradigm is to try to extrapolate from foundations of physics and biology that we can count on remaining constant over the considered period. Trying to really get down to the most fundamental question of end user computing, I think it's arguable that the core is "how do we do IO between the human brain and a CPU?" With improving technology, effectively everything else ultimately falls out of the solution to creating a two-way bridge between those two systems. The primary natural information channel to the human brain is our visual system with audio as secondary and minimal use of touch, and the primary general purpose output we've found are our hands and sometimes feet, with voice now an ever more solid secondary and gestures/eye movements very niche. Short of transhumanism (direct bioelectric links say) those inputs/outputs define the limits of out information and control channels to computers, and the most defining of all is the visual input.

Up until now, the screen has defined much of the rest, and a lot of computer can be thought of "a screen, and then supporting stuff depending on the size of the screen." A really big screen is just not portable at all, so the "supporting stuff" can also be not portable which means expansive space, power, and thermal limits as well as having the screen itself able to be modularized (but even desktop AIOs can pack fairly heavy duty hardware). Human input devices can also be modularized. Get into the largest portable screen size and now the supporting gear must be attached, though it can still have its own space separate from the screen. But already the screen is defining how big that space is and we're losing modularity. That's notebooks. Going more portable then that, we immediately move to "screen with stuff on the back as thin and light as feasible" for all subsequent designs, be it tablets, smartphones, or watches. The screen directly dictates how much physical space is available and in turn how much power and how much room to dissipate heat. And that covers nearly the entire modern direct user computing market.

Wearable displays, capping out at direct retinal projection, represent a "screen" that can hit the limits of human visual acuity while also being mobile, omnipresent, and modularized. I'm really actually kind of surprised how more people don't seem to think this represents a pretty seismic change. If we literally have the exact same maximalized (no further improvements possible) visual interface device everywhere, and the supporting compute/memory/storage/networking hardware need not be integrated, how will that not result in dramatic changes? It's hard to see how "Mobile" and "PC" won't blur in that case. Yeah, entering your local LAN or sitting at your desk may seamlessly result in new access and additional power becoming available as a standalone box(es) with hundreds of watts/kilowatts becomes directly available vs the TDP that can be handled by your belt or watches or whatever form mobile support hardware takes when it no longer is constrained to "back of slab", but the interfaces don't need to necessarily change. Interfaces seem like they'll depend more on human output options then input, but that seems likely to see major changes with WDs too, because it will also no longer be stuck in integrated form factor.

WDs definitely look like they're getting into the initial steeper part of the S-curve at last. Retinal projection has been demoed, as well as improvements in other wearables. We're not talking next year I don't think or even necessarily the year after, but it certainly feels like we're getting into territory where it wouldn't be a total shock either. And initial efforts like always will no doubt be expensive and have compromises, but refinement will be driven pretty hard like always too. I don't think the disruptive potential can possibly be ignored, nobody should have forgotten what happened the last few such inflection points.

>I don't see this happening. PCs are tools for getting real work done. Mobiles are mostly communication and entertainment devices.

This line of reasoning though is fantastically unconvincing. Heck even ignoring the real work mobiles are absolutely being used for, and given the context of this article, I pretty much heard what you said repeated word for word in the 90s except that it was "SGI and Sun systems are tools for getting real work done, PCs are mostly communication and entertainment devices".