I agree on the Stargate example. That series went down when O'Neill (Anderson) left. The replacement character Mitchell was OK but it was never the same without O'Neill. However, they did at least have the decency to not kill off or ruin O'Neill in any way. Not to mention that Stargate SG1 never became as bad as Stargate Universe (yawn!). As for changes, I prefer the Voyager crew as they were in seasons 1-3 of the series and in the books. That's why I rather re-read "The Black Shore" for the umpteenth time than spend money on the relaunch books.