Too late. They most likely missed the crypto train. Banning crypto ads and accounts damaged their reputation and it wasn't already in a good shape before it.
It will still create some hype however. It still has a name which is worth millions of dollars. Just a name...
With a brand worth millions of Facebook's dollars can attract many investors. But with the option of stablecoin release will make Facebook not get significant investments from potential investors if they don't bring in many promotional packages. Because stablecoin is always at a stable price, it is not profitable for investors to hold it and the cover is a drawback.