Personally I don't think Republicans gaining ground would be such a terrible thing any more. For one, Democrats have proven they either can't or are unwilling to get shit of consequence done; second, Republicans have had a pretty easy go of it working the whole unilateral-opposition-to-everything campaign they've been running since January 09. Right now political failures are being pinned (for the most part, rightfully so) on the Democratic majority, but once Republicans actually gain back some ground then they can (and between the public and the media, will) share some of the blame.
Listen to just about any high-ranking Republican and it's obvious they don't have shit for ideas about how turn things around in this country, and being typecast as the powerless, helpless "minority" they haven't really felt the need to come up with any. Pretty soon they'll have to put down the 24-7 comeback campaign, however, and actually attempt to get shit done. That's when the show starts.