I think it would work better as a whole park than as a land, because a park could offer the kind of variety that's honestly needed to make a decent villains area. I don't think the villains land is going to be very good -- at least not as as showcase for Disney villains as a whole. I think it'll have to mainly revolve around a small handful, which is fine, but there will probably be a lot people who are disappointed that their favorite either doesn't appear at all or is a very minor part.
I certainly don't think they should actually build a Villains park, though. I just don't think a Villains land is a good idea either.