^ It's the same as airport trains. Many, if not most of the riders are workers and not leisure travelers. Any dense concentration of employment with limited parking can be a solid candidate for transit service.
South Beach is a pretty dense concentration of restaurants, clubs, and hotels which all employ tons of people. The tight confines of the island mean that parking is limited and those service industry workers can't afford it.
Also, it's not clear that Baylink will actually be an extension of MetroMover. It may be a totally separate PRT system (ugh) or a streetcar with some elevated segments.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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