I wasn't a shipper in the early years, but at the point of seasons 5/6/7 when the show kept telling me how perfect they would be together, that was when I was ready for them to just get on with it already and pair them off. It got annoying by the time of season 8 when CC still seemed so afraid of resolving the sexual tension and giving us any straight answers on whether they were a couple or not, at some point he should have stopped stagnating their development. I suppose that The X-Files was never really a character-centric show though, and CC's focus was never on character development...