Here's the thing about fads, there's always a new one to take its place.

Usually a little different and sometimes a little better in ways, but still a fad that pretty much does the same thing.

People might get bored with the farmville rewards, but I'm sure something will take its place.

And even if the userbase falls by 50% or even 75% in 2 years, that's still a freaking huge number of users.