Yes. I can probably name 40-50 in my church alone.Can you name 5 people that have a smartphone that do not game on them in some fashion? No... then there is crossover. Sure it's a rather ephemeral crossover but it is there.
Casual gamers are also not hardcore gamers. Why do you think people are trying to make the next flappy birds rather than develop for consoles? Even that is an entirely different market from the hardcore gaming market.
If you're arguing that cellphones dictate gaming, then you should also argue that anyone with a smartphone should also have a $5000 gaming PC. Which as I'm sure you can also guess, they don't have. Making the leap from cellphone to PC gaming is just as absurd as Cellphone to gaming console. It's not even close.