Are craft breweries in a beer bubble?

I love going to small craft breweries and sampling their beers.
But I’m beginning to wonder if the fast-growing popularity of these small-batch breweries and their products is more a fad associated with a decent economic expansion rather than a true change in the American beer drinker’s taste buds.
Too often, I’ve seen economic gravity catch up to fast-growth consumer-centric industries. I don’t want to say the beer bubble is here, but I’m skittish. For example, how