Ginsburg was worse; Feinstein at least was doing this in a situation where if she did keel over, a Democratic governor would replace her with somebody whose politics were broadly similar to her own, but Ginsburg knew perfectly well that her replacement might undo everything she accomplished and she refused to retire despite that.
The tourist-y parts of it are pretty much all newly rebuilt anyway; there’s not much of the original wall left at Mutianyu or Simatai or wherever.