Disney has made several attempts at art nouveau in recent years, from the Shanghai Disneyland Hotel, to the Fantasy Springs Hotel, to Adventure Way in Paris. While some are better than others, they all leave something to be desired.
For whatever reason, thus far, they’ve all looked a little cheap and not terribly convincing of the style. While using it for a villains area has the potential to infuse some whimsy in it that may help disguise its pitfalls, I’m not convinced of WDI’s ability to truly pull off art nouveau.