Swift's been putting out albums since 2006, but I can't think of any other pop star who came out around the same time that has stayed in the public consciousness without diversifying or shifting into other arenas of entertainment or genres of music. (I don't think she's impressed anyone, one way or the other, with her few non-music video acting roles.)
Having a fan army on a scale comparable to BTS or other Asian pop acts does seem unique to Swift outside of those acts. Sure, there are other groups of intense fans of a musical act, but both the groups and the acts tend to be smaller. That could certainly be sustainable for a longer than average career, depending on the expectations of the artists involved.
Maybe Swift has inspired her fanbase in part because her media coverage usually tightly links her personal life to her music. This goes beyond just analyzing which single is about which relationship to include tracking which current or potential romantic partner was seen with her or attended her latest show. And it's been happening for at least a decade. Even in this period of more intense media scrutiny, this seems the hardest part of her trajectory to replicate.
David