The whole idea behind Voyager was that it was a sturdy, smaller ship on a long journey home. The sense of containment reinforced the notion of Voyager as home to a stranded crew and the scale of having to return to the Alpha Quadrant.
The Excelsior on the other hand was a state of the art ship in her time. If a series were to be set involving the Excelsior then it would have to be a different premise from Voyager.
A few years ago a Sulu series may well have worked. I agree people are giving him a hard time because Takei has performed well outside of Trek where he's not limited to the same supporting role. But to be honest, by the end of the 90s/early 2000s there was Star Trek overload. It could have been a Sulu series or Enterprise, the point is it wouldn't have endured.