David Muir, who? It appears George Stephanopoulos has a new rival to look out for at ABC. Stephanopoulos’ political drama with President-elect Donald Trump has followed him into the new year and sources tell us his colleague — and “This Week with George Stephanopoulos” co-host — Jonathan Karl, “wants George gone,” so that he can sweep in and take over the Sunday morning news show. “He wants the show, and he sees [ABC’s Trump settlement] as an opportunity,” a source told us about Karl’s ambition to move into Stephanopoulos’ spot. While Stephanopoulos’ name is on the show, he shares hosting...