Maybe, maybe not. If Rudy were to win big over Hillary for example and we get back Congress, the attitude among a lot of people might be quite different than it is today.
Winning back the House anytime soon is probably out of reach, unless Ma Pelosi and crew really jack things up, and they appear to be too smart to let that happen.
On strong GOP coattails, I would expect the GOP to get a net gain of maybe 6 or 7 House seats in 2008. All else being equal, it will be status quo for a while, though.
THere are some who argue that the type of voter that comes out to vote for Rudy might well vote democrat down-ticket.
The beauty of the Rove strategy was that, if the President won, it meant a lot of true republicans came out to vote, and it helped the down-ticket races. If your appeal is to the center, you might draw people who would vote against true conservatives.
The kind of person who is excited to show up for a pro-defense pro-abortion president might not vote for a strong pro-life pro-2nd-amendment congressman.