^
An interesting summation of the various later Trek series. I never thought about it that way. Even though both Sisko (especially) and Janeway were central to their shows, like all Trek captains, perhaps they weren't as necessary to each shows' success because of the central theme/arc, for DS9-you had Bajor rebuilding and the Dominion War and for Voyager getting home. These things could've been achieved with or without either captain. With TNG there was no central theme, beyond the vague exploration, so I guess it did rely more on the force of personality of it's characters, centered on Patrick Stewart's great performance.
Ironic because even though I feel that DS9 had far better written/developed characters than TNG, Picard's personality, his character, becomes more essential to his series than Sisko's. Then again, since DS9 had so many better written characters, Stewart's performance stood out. I mean, outside of Picard, Worf, and Data, you had a drop off in terms of development, it got fitful, with snatches here and there for Riker and Troi and crumbs for Dr. Crusher and Geordi.
Even though Enterprise had the weakest character development of all the series, I could see that show doing without Archer because of the overall themes-Xindi Crisis, Romulan War, birth of the Federation, unlike TOS going it alone without Kirk, because like TNG, it relied more on Kirk's force of personality. In fact, with ENT, I think many fans wouldn't have minded if Tucker had become captain anyway. If he had, because he was the best written/developed character, arguably, on the show, it might have shifted into an interesting mix of character and arc both driving the series.