There's a new area being reclaimed from the sea which could potentially be used and is right next to the existing track. It's due to be open in 2025 (I believe the land is already reclaimed, but not available for use yet)
Monaco's $2.3bn project to expand into Mediterranean Sea - CNN Style
Thank you. I saw the very early work that was going on to produce this additional land. But I was of the opinion it was primarily for high rise accommodation. And it didn't look that big. But anything is worth a try.