This is a little too post-apocalyptic. I think the biggest thing you miss in your argument is that a lot of human beings don't really want to do the same thing as all the other humans. There will never be a point where Amazon is the only option for E-commerce. Wordpress will never be the only blog software option. There are millions of people who won't go to Walmart simply for the fact that it's Walmart.

Honestly, do you think there will be point when we say, "Welp, we've written all the software. Now what?".