Razorfist: The Attrition of Ambition

Razorfist raises an interesting point here which can be applied to science fiction and fantasy. Who are the visionaries of today's science fiction? In the past, we had Campbell, who, for all the recent fire he's taking from Pulp Revolution, gets it because he is the man who molded modern science fiction in his image. As his influence weakened in the 1950s and 1960s, the genre grew stale, narrowing only to a handful of writers. Upon Campbell's death, it can be argued that science fiction has been stumbling about looking for a vision to guide it. Who is out there showing what science fiction can be? (There are a lot of voices, mine included, caught up with telling people what it should be, but precious few out there to emulate.)