Completely agree. I had a reply that turned into a mega rant in another thread but basically yes, two different target groups and thus I don't see why the "core" gaming/consoles will disappear or be taken over, unless that "core" moves to the mobile scene, which I have a hard time seeing...
Personally, I see it as a big change in gamer composition, population size and reach. ^_^
Whether core gaming consoles will disappear will depend on the vendors and game developers, not Apple.
The definition of core games may shift due to the composition change.
For the existing core gamers, I am more inclined to think "The more things change, the more they stay the same". But their gaming habit may change also as they grow up and become too busy. In this sense, the game developers are also evolving to follow their fans.
For me, I am very open to gaming on the Vita just because it's always with me and the experience is close enough now. I think some startups are creating web-based core games (yes, core games) too. Their are getting paid subscribers in no small numbers, and those folks play game and work on the same machine at the same time just because well... the web browser is always there for them to track their gaming progress, and participate.