If the Democrats retake the House, as looks more and more likely, the political dynamic in Washington will shift decidely.
It is a good time for the Democrats to regain the majority at this time. They've been lost in the wilderness long enough - 12 years - to fully appreciate what it means to be back in the majority, while at the same time they are not so far from when they last lost power - 1994 - that they have no institutional memory of it.
This is good because it means there should be enough Democrats who remember the mistakes that were made prior to 1994 so that they are less likely to repeat them. Plus they have the fine example set by the corrupt GOP as a kind of How-Not-To-Govern Guide.