Sure there are new comedic geniuses. They just wont be recognized as such until they are a good deal older, if not dead.
Judd Apatow and his neverending stream of “chick flicks for guys” is certainly exploring new territory and showing off a few gem comedians.
South Park has taken the reigns from George Carlin and other trailblazers, consistently finding new and creative ways to push the envelope, just because the envelope exists.
Adam Sandler, after “Funny People” and “Punch Drunk Love” has shown a more interesting a creative and human side to his limitless energy, and will probably go down in history as one of the better comedians of our era. High energy will always be funny. Jack Black is such an example. In the proper vessel, he can make people roll on the floor without telling a single “joke.”
Until 1999 when it ended, Mystery Science Theater 3000 forged totally new ground for comedy,
The people behind Spongebob Squarepants seemed to have channeled Jim Henson by creating smart and funny episodes that adults can actually enjoy to watch with their kids.
Demetri Martin, though a little limited, is constantly trying out new ways to define comedy.
Comedians come in many forms. There are probably just as many hacks today as there always have been, but don’t discount brilliance because it’s modern.