I think this is just way too simplistic of a view of it. People won't just follow two exact patterns of behavior regardless of their environment. We all have, to varying extents, a proclivity to instant dopamine-based gratification.

The difference now is that the technology that now exists makes this sort of gratification both constantly available, and better than ever at scratching that dopamine itch.

The evidence the article presents also points towards something happening after the advent of smartphones, and not before.