I live in a country that throws away half of its prepared food. Like we're not even talking about some chopped up animal corpse that sits out for too long and has to be discarded before it goes rancid - in the US we strait-up assemble food in some factory, wrap it plastic, burn fuel shipping said wrapped and assembled food to a store halfway across the country, unwrap the food, put it in another container, and then at the end of the day just toss the remaining contents of the container into the garbage bin because you've got a few more tons of shipped and prepared food already in storage that needs to be sold. This is the post-scarcity future.
Ok, slaughtering is a problem, but I think it will sort itself out eventually.
I do not know what the issue with construction is, but it is highly unlikely that the same city have thousands unemployed playing games who could otherwise work there - if only they were a bit more miserable.
There are other articles about this (e.g. http://www.vulture.com/2017/02/video-games-are-better-than-r...) all confirming that unemployed people who play video games don't have the same increase in unhappiness that other unemployed people have. Which might be good for their short-term well-being, and is something to keep in mind for the post-scarcity UBI future if that ever happens, but in the medium term worrying, both for the individuals and for the economy generally.
There are currently sectors- like construction- which are having trouble finding labor as the economy picks back up. Are these people going to avoid re-entering the labor force even when they can get a job, and are we ready for the consequences of that? And even if they do, they'll be starting out way behind on building household wealth and work experience.