"They're really thinking outside the box," says one well-connected source of the Republican National Committee's effort to reform its system of presidential primary debates. "They're looking at everything."Everyone knows the RNC leadership believes there were too many debates last time around and intends to cut the number in half for 2016. And by now everybody has heard of the group's decision to shut out NBC and CNN from sponsoring debates if those networks go forward with Hillary Clinton documentaries that many Republicans believe will be little more than campaign commercials.But what has gotten less attention is Republicans are fundamentally rethinking their whole debate system.