Here's what we know:
* Daniel Handler (Lemony Snicket) has stated that he considers the series finished. He has said that he feels the story of the Baudelaire orphans has been told, and he doesn't want to revisit it.
* There have been several spin-offs and companion books. These include "The Beatrice Letters," "Lemony Snicket's The Unauthorized Autobiography," and "All the Wrong Questions."
* The Netflix series is currently considered finished. The show wrapped up the main story in its third season.
So, while it's not impossible that Handler might revisit the Baudelaire orphans, it's not likely. He seems content with the story as it is, and there are no official announcements of new books.
However, the world of *A Series of Unfortunate Events* is rich and vast, and there's always the possibility of new stories or spin-offs in the future.