In 10 years I see Pokémon pushing further into virtual reality with the goggles, so you can live out the life of a trainer for real; and yes, my kids will love it when they're little, probably not when they're teens, but still then I'll love it.
My love for this franchise will never die.
I'm a teen yes I like Pokémon and there's nothing wrong about it and still watch the animé. BTW I can't wait for tomorrow's episode.
But my point is: I highly doubt that it'll die in the next 20 years; it will take a back seat in popularity like Mickey Mouse and Buggs Bunny did later in the 70s so I believe it will still be here as more fans grow up, but the addictiveness of the games will never fail :)