. . are eating into the old mainstream beers.
This harkens back to the great brewery consolidation many years ago. The big guys bought up large numbers of small and regional breweries and closed them down for their market share.
They sold all the equipment as scrap. There was their mistake. It was sold for scrap - it was not destroyed.
This launched the craft beer movement. Suddenly brewing enthusiasts could buy perfectly usable brewery equipment at scrap yard prices - and set themselves up in business.
On another point - a demographic study of who is going for "lite" and who is going for the craft and specialty beers would be interesting. I suspect the brewing industry is doing just that.