Everyone knew that the 2% cut in the Social Security tax was a temporary measure designed to boost the economy. The fact that it's expiring as planned is not a surprise, and hardly newsworthy.
(This is the same baseline-based math which calls a reduction in the rate of spending growth some sort or another of a "devastating cut", naturally, though you'll see more ostentatious examples of this rhetoric with California's recent education-policy games than you will at the national level.)
I reckon most people -- myself very much included -- 1) weren't aware of the tax change in 2010, and 2) definitely didn't have its expiration on their calendars.