There is no permanence in politics. Democrats patting themselves on the back at a job well done will at some point be drowning their sorrows in beer as Republicans again talk about their ridiculous fantasy of a permanent Republican majority (this time without steel tariffs).
People shift over time. Pendulums swing. And in the age of instantly lame ducked Presidents upon their swearing in for a second term, discord has ways of getting the best of any political party.
Conservatives who rallied to George W. Bush through No Child Left Behind, steel tariffs, Medicare Part D, Harriet Miers, etc. stood with him until the end. Many held on through TARP and the auto bailout and immigration, unable to see the fractures or trying to will them away. Now the GOP is dealing with the fall out of that legacy.
Consider the suspicion conservative groups have of Bush’s architect, Karl Rove, starting a new group supposedly to support “the most electable conservative”. Conservatives are still trying to work their way back out of the Republican Party and stand up on their own again.