By this standard, Beethoven's 9th Symphony is also no longer "relevant".

The first to do something are remembered, those who come after must be significantly better or different to be recognized. If someone wants to see Caravaggio's style, they are likely to simply see Caravaggio - it's just name recognition, nothing to do with the "relevancy" of the style itself, whatever that means (Popularity? Or a self-fulfilling justification for whatever style the art world elite is pushing?)

And there are in fact newer artists with name recognition that painted in a representational style (but not the exact same style), e.g. Dali, Frazetta, Giger, Beksiński.