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It seems silly to say there is no audience because it’s already possible to transfer money. Facebook is all about cloning an existing product and making it easy for millions of people use it by putting it in an app they already use for an hour every day. I think if they are permitted to launch, they will get a lot of people to use it.
I am a happy customer of both a bank and a grocery store. If one day the grocery store decides to also open a bank, I won't suddenly move my accounts there just because I go to the grocery store every week. That's why the grocery stores trying to offer credit cards usually have some loyalty programs (e.g. points/discounts for in-store purchases). And BTW, they typically just partner with existing banks and not try to…
Grocery store handle a surprisingly large amount of money transfers and act as pseudo-banks to many of the unbanked. Some of them have their own banks on top and others have bank branches in them. Lots of people use these services.