Where are Republicans going to pick up the seats to get control of Congress? especially in the Senate where they would have to pick off a bunch of deep blue states.
The recession is bad enough to allow the Republicans to make large gains similar to that of the Democrat's gains in 2006. However, I agree that it would not give them the Senate. At the same time, it would be a rather narrow Democratic Majority, possibly 53-47. The House would be the reverse of today.
Also, Warner, Clinton, and Obama are practically tied.
Democrats only gained 30 seats in 2006. Republicans would need to gain 80 seats to get to where Democrats are now. To do that they would have to pick up seats in inner cities and other safe Democratic districts.
2006 was the exact reverse of 2004. And 2008 made some improvements. So it's possible over two cycles.