I was diagnosed 1994, and I do not live in the US. Back then I will say it was harder to find gluten-free stuff. But it progressed a lot long before the 'diet-thing' happened. Bread mix has always been around here, however more alternatives have popped up over time.
I happen to live in a country where we've always had a strong lobby group for celiacs though, and what I see mostly after the diet-thing came about is that there's a lot more almond flour and things like that.
I suppose it's different in other countries, I will agree with you that new products arise that would probably not have come otherwise, but what scares me is the threat of not being taken seriously when you mention you don't eat Glute.