Yeah, but how many of them actually move on from Farmville? Most people I know who play that sort of thing have zero interest in other types of games.
Social and casual games also don't do a whole lot to counter the whole "videogames are a waste of time" attitude, because they're designed to waste time for when you have "nothing better to do."
I'm not too social with older people into this stuff, but I know a hell of a lot of girls who have moved onto mainstream popular titles after having experienced Farmville/Mafia Wars/Zynga Poker. Granted it's harder to get them to move onto indie games, but I did get 1 of em into An Untitled Story, and a group into Braid and Recettear. It'd make sense if older people would be harder to sway, even if it's the popular mainstream titles.
Also, I do agree these games don't counter that attitude, but I think people with that attitude are content with that anyways. They have an excuse not to move onto time-wasters like your average console game or indie game since they'll be worried they'd be hooked. Facebook games usually have an energy system that allows it to be played an hour or 2 per day so they get their constant wave of accomplishments while keeping their attitude towards games.
Returning to my original point on the topic, I can't agree with others who "don't like manipulated" or "being exploited by the designer's ways of creating addiction", it sounds weak. You don't like Facebook games cause they exploit players' minds for money? It's sorta like hating on shops down the road or any business that sells products, "this shop sells all types of candy, they're exploiting the fact that kids love candy, just for money, these kids are being manipulated".
This is coming from someone who is currently not hooked to any Facebook game, I like innovation.