Of course gamification has been around for a long time, and will likely grow. I think that the most natural place for it to continue its growth is in education. I mean, take a look at what Khan Academy is doing. For better or worse (and I really think it could be either), I think that is the future of K-12 education.
I think that the challenge is that although gamification can increase engagement and motivation, it changes the underlying type of engagement and motivation. The goal becomes to do well at the game, rather than to excel at the job, education, etc.