Pretty sure you couldn't convince a teenager to give up Snapstagram or Instabook or whatever is the next thing. Must be that these bring prosperity to their lives :).

I think we have to go to even more basic questions: what do people think about when they say prosperity? Having more money? But is it having more money than today's average or having more money than they used to have?

One thing's for sure, I wouldn't say more tech = more prosperity. By this definition alone almost every person is the world lives a more prosperous life by virtue of having a $20 burner phone that they didn't have in the '80s.

No, prosperity is "financial success" and that's related to the people around you and to some basic standard, a baseline of the times you're living in.