It's not about any specific other area "suffering." It's about preferring the organic spending patterns that emerge from consumers' voluntary transactions ("the market") to a centrally directed system. Even small amounts of consumer spending provide price signals indicating the relative desirability of goods and services. Any intervention that alters those price signals can be detrimental because that reduces the economy's ability to respond to consumer demand.
And yes, other areas will "notice." Not all other areas, but some. Despite the overall total amount of consumer spending, individual industries and companies aren't doing 43 trillion in business.
Also, those numbers seem suspect. The entire World's GDP was around $72.5 trillion in 2012. According to those numbers, the US is accounting for nearly 60% of the entire world's consumption of goods and is spending nearly three times its own GDP (US GDP in 2012 was about $15 trillion).
The
HFCE numbers for the US put actual spending in the $11 trillion range. Admittedly, $1.14 billion is still a very small percentage of $11 trillion, but the worry over price signals stated above doesn't change.
EDIT: Yup, US consumer spending was just under 69% of US GDP in 2013
according to the Fed. With a GDP of $17.4 trillion for 2013, that means consumer spending was about $12 trillion, not nearly $43 trillion.
ZV