There was a time when regular families had desktop computers at home. The marketing was intense, the machines were expensive, and the sales numbers were real. The PC was the gateway to all of the spoils of the internet and things were booming.
Now families tend to have a collection expensive personal pocket supercomputers, instead. It's hard to justify the cost of a properly-stodgy computer when everything is online and the machines that everyone already has in their pockets are Good Enough to get things done (including entertainment).
But I can accept that I'm not everyone.
I suspect that we'll have whole generations of people who manage to grow up and grow old and without ever having, or even seeking, the opportunity to spend quality time gaming on PCs.
I think that's alright. Things are allowed to change.
You used to be able to dial TIM on a landline phone to check the time (for free?). Then you (if you were a computer nerd) checked it on your computer, then on your cellphone. Because that's what was available. There was no connection between knowing the time and landline phones - people just had landline phones so it was a convenient way to deliver the service. That's how it is with mobile games now.
Remember Java and Flash applets? You could make anything you wanted as a native application, but RuneScape took off because you didn't have to install it.
The "big family computer" became an iPad.
If you are a games studio and have resources for three projects this year, do your investors want to see a phone, PC, or console game?