The one thing I think is even more constant in our political landscape is the elected official's keen eye for self-preservation. I expect there to be movement on both sides to avoid not just the cliff but even to avoid large-scale market downturns.
I've heard pundits say that with the election just past, that politicians will do what their hearts tell them. I think their hearts will tell them it's only 2 years (or 4 years, or 6 years) to the next election. The public will not like a deeper recession, nor will the top 10%ers want their 401k to be savaged...hence the politicians will work together just enough to avoid the meltdown while still being able to tell their party bases that "we won"