But more importantly, I think what's being overlooked here is the fact that New Orleans Square, Lafitte's Landing, and the Blue Bayou are not meant to represent unchangeably delineated geographical locations that reflected some sort of "reality," either past or present. They're all fantasy recreations of a certain existing place, but they're not intended to be taken as literal, just as the POTC storyline itself is not meant to be taken as representing the historical reality of piracy in the Caribbean of the 17th and 18th centuries. Everything is a fictional construct, part of a dream state. Going from "Frontierland" or "Adventureland" to "New Orleans Square" to "Lafitte's Landing" to "the Blue Bayou" to "the Spanish Main" is all meant to represent going from one ethereal dream to another, where time and space are not clearly defined, and characters and events from the historical past are intertwined with fantasy characters. This insistence that newer fantasy characters not be involved with what has always been a fantasy story is absolutely ludicrous.
Spanish Main was the mainland coast of the Spanish Empire around the Caribbean, and even included Florida. The town could be in what is today Venezuela, or Colombia, or Mexico, or Panama, or some other location. A Spanish town, to be sure, and definitely on a coast, so it could be on an island, but other than that, we don't know just where it's supposed to be (other than somewhere in the Caribbean).
Don't get me wrong; I understand that a lot of people have attached sentimental value to the ride and its story and its design, and would like to keep it in perfect original condition forever, but with the advent of the films, a little retweaking isn't changing the ride in any fundamental way, and as long as it retains the essential thematic spirit of the entire POTC fictional universe, certain minor changes are acceptable. POTC hasn't been ruined irreparably, and won't be, if a few minor tweaks and story rewrites are made here and there. The basic original storyline is still intact. These minor changes just help link the attraction to the films a little better, and it has to be kept in mind that although the ride itself has been tremendously popular for 40 years, not everyone has experienced it; some people have seen the films and never been on the ride, and we'll continue to see this sort of thing for some time to come. These little tweaks and changes are done to help flesh out the relationship between the ride and the films and not make them seem like they're not part of the same fictional universe.
They probably should have some at Disneyland and WDW. Perhaps they will at some point.