From the CBO Director's blog:
The United States faces a fundamental disconnect between the services that people expect the government to provide, particularly in the form of benefits for older Americans, and the tax revenues that people are willing to send to the government to finance those services. Changes of the magnitude required to make fiscal policy sustainable could have important economic and social effects—but they also provide an opportunity to address existing concerns about tax and spending policies. Given the time required to implement significant policy changes, determining those changes is an urgent task for policymakers.
Will policymakers act in time or will we end up like Greece?