The food industry won't stop because it's profitable. And I don't want to see more regulations passed because really, those don't do much but give more power to those who don't really need it (Big business or the government - take your pick!).
A good way to battle from within is to look at where certain fast food chains get their stuff from, and really support them. For instance Chipotle believes in "Food with Integrity" - they try their best to get all natural ingredients and to get meat from places that ACTUALLY care for their animals. It differs by locations (Logistics and all that) but from I read from their site all locations try their best to live up to the FwI ideal.
Carl's JR recently released a promo "All Natural" Burger that uses supposedly all natural beef. If that thing sells pretty good, hey they might keep it on perminately and maybe it might start a new precedence if it keeps it up.
GMOs I think depend on which ones you're consuming. I don't think all GMOs are bad as heck, bananas are Genetically Modified too! They aren't naturally that shape.
As far as Fast Food being this evil boogyman to health, I don't think so. But then again, I'm not (suppoedly) forced to eat it every day, but I think there's ways to eat a better diet through research and planning. It might not be organic, but I think even just upgrading from continuous fast food would be a start.
And of course organic is expensive. It takes more effort to make sure something is "organic" and doesn't get ruined. So naturally that'll drive the costs up for it. That's why GMOs and other such foods are cheaper - they're cheaper to produce. So I guess one of the large challenges is figuring how to get organic food produced cheaper and more efficiently time and effort wise.