The main thrust of the article is that people will limit themselves to their apps. In my opinion, those would be the same people who limit themselves to Facebook or email. Domains are missing those people already, and I don't see much change. There are only so many apps one can have on their smart phone before it gets cumbersome. Also, the vast majority of searches for information on the net cannot be met by an app in your possession. I simply cannot see people having an app for every question they might come up with.
Conversely, I don't see people downloading an app for every website that provides them with an answer. If I search for "how to chase a squirrel out of my attic," is there an app for that? (SquirrelAway.com?) Even if there were, would I want it? Why?
Even for the standard searches.. say recipes. I can see people downloading recipe apps, but I won't be one of them. Why should I limit myself to the recipes on one app/website when there are tons of great websites and even small blogs with the recipe I really want?
The apps I use are for sites I visit regularly, such as DNF and Godaddy. Before those apps came about, there was no way a domainer could come between me and either of these websites. They were bookmarked (and incidentally, why didn't anyone claim bookmarking would kill domains?), or I would just type them in. And that's where type-in comes in. Typo domainers are screwed.
Tablet, ereaders, smart phones, desktops.... they're all good for domains. Anything that brings more online people who click ads and spend money. Obviously, some domains will have to be especially developed with mobile in mind. All websites will have to, if you want to optimize conversions.
But I see zero threat from apps. None at all unless you are a typo domainer.