The bejeweled market and the switch market are two very different markets.
The fact that grandmas are playing a couple games on their phones does not diminish the console market.
Yeah, it does because those grandmas have grandkids who are growing up where their first interaction with games is in the tablet/mobile platform. The industry already HAS been impacted. You are ignoring the fact that majority of the world can't afford consoles, but damn near everyone has or can have a phone. Once when get to a point where graphical fidelity is good enough, mobile games will be just as compelling as console ones and by that time, the generation that grew up playing mobile games will be in the prime money spending demographic (18-24).
I used that example to demonstrate the platform's widespread accessibility.
I'm not saying consoles are going anywhere because they aren't. But If you think that the handheld market isn't going to be swallowed up by mobile you kidding yourself. It was already a one horse town in the first place (Nintendo) and now with the Switch they are saying "Hey, we can give you a handheld experience AND a console experience."