Won't Happen.
Jon Stewart had Paul on back before the primaries, and so did Colbert.
After that however, David Frum, John McCain/GOP crony and licensed talking head, whispered to Jon Stewart that "If you knew what I knew about [Ron Paul], you wouldn't like him".
Presumably it was spread that Paul is an anti-Semite Racist, because after the appearance, I emailed Frum to ask what he meant, and he only linked the New Republic Article about the newsletters, confident that they would show me that Paul was racist.
I emailed Frum back, told him how ignorant he was being about it, and if that was his only problem with Paul, he's both mistaken and highly off-the-mark for letting that specific incident get in the way of one's political philosophy.
Jon Stewart hasn't so much as mentioned Paul's name since.
That's how the Media Blackout spread: intimidation from a few (otherwise insignificant) people that just plant that germ of doubt in reporters, anchors and editors that they shouldn't be covering that "horrible hate filled loony racist".