The western world right now is in a bit of a defeatist mood and pessimism reigns supreme. And while I can't deny that all things end and in some sense civilization is scheduled for some receding, I find myself wondering what impact this sort of technology will have on that process. Technology is speeding everything up so much and so fast... what if technology speeds up our next "dark age" from centuries to decades...…
Well, smartphones simply enable you to do things that you can't otherwise do. I don't think they'll have much of an effect on how long our next Dark Ages lasts. The dark ages were primarily due to culture, not ability. Smartphones enable culture to morph in interesting ways, but they don't override it. People will still be people.
Deep inside we all are shockingly selfish and lazy little animals. We all take the easiest road, at least what for our selfish desires seems to be the easiest road. Sometimes, it's looks like a hard or unselfish road on the outside, but needed to fullfill our own selfish needs. Even buddisths are selfish, as they try to be free from selfish desires for the selfish reason of reduce pain in their live.
There's always a melt down of higher cultures. People having all the tools to fullfill their basic needs loose the drive to achieve. That's why I generally see this "we make the world a better place with all our great services" direction quite sceptical. It was never easier to distract ourselves with mobile devices, but do we benefit? No, Apple, Google, FB, MS and Amazon do.
BTW: One of my favorite movies is Idiocracy :-)