Earlier quoted context omitted.
It is a self regulating problem, bored people create entertainment until there are no other bored people left. Modern tech makes that process more efficient so you have less bored people, I don't see why that is a problem.
It's a problem if the things that people used to do while bored were useful and now that social media is handling the boredom problem those things are not happening anymore.
What useful things are you talking about and is their evidence of their decline?