I don't think the Democrats will have control for long. It's going to keep going back and forth like it always does. The people are fickle and have no patience. The reason we are in the mess we're in is because Obama couldn't pull a magical silver bullet out of thin air. He and the Democrats didn't fix everything over night, so the Tea Party gained a foothold in the name of sending Democrats a message for not giving the people instant gratification. Now the far right wing is fucking everything up, and although we'll have to see, the Democrats may very well end up getting control back. Of course, things might start to get a tiny bit better, but not fast enough, as always. Add to that, a few Democrats will do something to upset a bunch of people. So, naturally, all Democrats will be sent a message again, and Republicans will gain control.
Welcome to American politics!