I’m a huge fan of the original U.K. version of The Office, but the U.S. remake ended up extremely popular in its own right.
The Ocean’s trilogy, James Bond movies, Spider-Man movies, A Star Is Born — they were all successful despite being rebooted with new casts.
A continuation — along the lines of, say, Jumanji: Welcome to the Jungle — could set a new story in the same world but with only cursory nods to the original Lost.
If done well, with new characters we love as much as the original cast, it could work.