Obsolescence?

Waiting for the Christmas parade at the great light-turning-on ceremony, I caught Miss Geek looking at this phone with undisguised curiosity. She'd turned away after I got my camera out, but agreed to pose...

...how long before these phones become irrelevant to youngsters? I guess there will always be those who don't want or can't afford a mobile, but their numbers may well dwindle to the point they're no longer catered for...