Peter David is New Frontier. It's not like Voyager or Enterprise, writers carrying on the tradition of a TV show. It's his 20ish book strong corner of the Trekverse. Other authors can include his characters in cameos or mentions (Gateways, Q + A, Destiny etc) but another coming in and taking over his series, characters and plotlines just seems wrong.
Unless of course it was done with Peter's blessing.