The Paulians weren't going to account for any more than Buchannan did in 2000; what, 2%, maybe 3%? Barr and the Libertarians are likely to see an upswing, if only because the Libertarians put forward the first credible candidate they've had in years, perhaps decades. They'll still only account for another 4% to 6% tops, largely because McCain has shored up most of the leaking to the Libertarians he was experiencing with the Sarah Palin nod - people such as myself.
Even with a maximum of 9% going to hyper conservative 3rd party candidates, I still expect McCain to pick up Teh Obamessiah's self distruction and run with it all the way to the end zone come November. I don't expect it to even be close.