回答
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The consumption rate of Japanese sake is falling, and even famous sake breweries are in danger of going bankrupt.
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Sake is less popular nowadays, and even famous sake breweries are in danger of going out of business.
消費量 = the amount of consumption
消費量 = consumption rate
「rate」と「amount」がちょっと違いますが、「the amount of consumption of Japanese sake」も「the consumption amount of Japanese sake」でも、ちょっと変に聞こえます。この状態で、「consumption rate」が一番言いそうな表現だと思います。