I am a history buff, and love to travel, so I 100% respect what you are saying. However, there are tons of similarities between Arab style architecture in Morocco, Egypt, Levant, Arabian Peninsula and even Iran (not Arab), which would be completely acceptable to guests. Also, it would allow Disney to reintroduce this part of the world (which has certain view amongst Americans) to the history, innovation and beauty of the Arab World.
Arabia may be more Arabian Penninsula, but predominantly Arab speaking countries (including Morocco...let's not argue over French Moroccans), could be represented.
For anyone confused, Arab World :
https://en.wikipedia.org/wiki/Arab_world