I am pessimistic too, but a tad less. After going over all the races, I can easily see the GOP losing IL, PA, and WI. The good news will be we will still have the majority, and could pull a flip in CO if the GOP puts up a decent candidate.
I think they should go after Reid again. If Gov Sandoval challenges him, Soiled Harry could be in for a fight. Hard to see Bennet of CO being vulnerable now but no one thought that about Mark Warner either, or even Mark Udall.