US Debt to reach almost 100% of GDP by 2028

Debt as a share of the United States economy is on track to blow through the previous World War II-era record within two decades and keep rising from there, the Congressional Budget Office said in its annual long-term budget report.  Generally assuming no change in current laws, growing budget deficits would push debt held by the public from the current level of 78 percent of the economy to almost 100 percent of gross domestic product by 2028, and to 152 percent of GDP by 2048, according to the agency.  http://www.rollcall.com/news/policy/cbo-us-debt-burden-set-to-break-record-in-early-2030s

So .. 152% of GDP by 2048.  Who cares?  It will never be paid back.  And there is no upper limit because the Fed can always electronically print more dollars.  The real questions are: 1) why do we have to pay taxes if the government doesn't need the money, and 2) at what point will the whole thing explode into hyperinflation?  If the hyperinflation won't happen in the next 10 years, then why worry about it?