Well, there's also a cause and effect loop you're ignoring: kids with autism or ADHD -- especially undiagnosed or untreated -- gravitate to video games because they struggle in other areas of their lives. When they struggle a lot, they play a lot of games. They weren't necessarily going to be employable anyway.
My wife's eldest is like this. He's autistic; really smart; and barely graduated high school because it was very difficult for him to keep a consistent sleep schedule, pay attention in class, do his homework assignments. He also gamed a lot. The gaming was a function of his difficulties, not vice versa.
As I've mentioned before, my wife is a child/adol psychiatrist. This gives her a lot of insight on this topic, and it's her opinion that excessive gaming is much more often symptom than cause.
What I've learned from her is how many parents actively resist mental health diagnoses for their kids and/or treatment. She has loads of cases where the mom or dad brings the kid in for ADHD treatment. The other parent comes in and refuses to acknowledge there's anything wrong. If they have joint custody, they end up head-butting but the "no way is my kid taking Ritalin" parent wins by default. So my wife tries to treat the kid but has the most effective and appropriate medications taken off the table.
Not surprisingly, a lot of those kids play a lot of games. Obviously the households are conflict-ridden and so they seek refuge from fighting, and in addition they aren't getting treated.
Also, my wife's brother had a kid with ADHD. He's a PhD in biochem from a top school (Emory, I think) but simply refuses to believe that ADHD is real. He wouldn't let his son get treated for that thing because it was phony and fake. Only when the kid attempted a suicide did the dad relent.