He seems to have a rather different opinion about how much computers (and/or software?) matter -- or that is the impression I got from parts of his talk...
It's an interesting talk but I'm not convinced as to how much it matters. But then there's different levels of 'mattering'
'mattering' is a relative concept like time.
I think it doesn't matter in the big picture ; we'll be around, software or not. ( Actually, he mentions some really scary stuff software has done from surveillance to making more destructive bombs, if anything it'll kill us
That said, there is no doubt that a lot of our modern lives touch software in some way or another, and that this will be increasingly so, and that a lot of how we do things has changed because of it.
Perhaps the real core of the matter is that, like he says, software development is hard and takes so much effort (the number of 100 million lines of code was dropped, somewhere in that talk), that, when you're actually writing software, only a very very tiny percentage of that will ultimately only matter in the grand total.
What I meant with writing software for software, or using computers for computers, is stuff like, what ide or text editor am i most productive with, having to install anti-virus software, what window manager to use, what os to use, etc...
So, each line of code you write matters pretty much nothing on it's own. It's likely that each piece of software you write doesn't either, unless you're working for some fancy research team or company. Most of the time you are fiddling with stuff that deals with how to make your computer experience in itself better, etc...
The result is using a computer not to accomplish anything, but simply for the sake of using a computer, and accomplishing stuff is a side effect that kind of happens when you put everything everyone does everywhere together.