Quick PSA... I need to iterate off the top that I did not create this fan theory. I'm only reporting it because it's interesting and pretty cool... and fun! This is about fun you guys! It's when you're engaging in an activity (like READING in this case!) where you find that you start to smile. I do it a lot and it's freakin' awesome.
So, now that that has been said, and you are prepared to really just go with this theory instead of being overly butt-hurt about it being different than the real-life story, I'm going to need you to do something...
Imagine Aladdin in a futuristic post-apocalyptic world. This theory comes from disneytheory.com and it's pretty sick.
The Genie, during the wardrobe changing scene reveals that they're in the future
When Genie gets out of the lamp, he says "10,000 years will give you such a crick in the neck." Later, he says that, in reference to Aladdin's clothing, his fez and vest combo is "much too 3rd century." If Genie has been in the lamp 10,000 years, how does he know about 3rd century fashion trends? It has to be year 10300 AT THE EARLIEST. Hmm... okay, stay with me here.
Genie is voiced by Robin Williams and mimics a lot of modern figures
Robin Williams absolutely kills this role as Genie, but since he's an improviser and amazing with voices, he mimics Arnold Schwarzenegger, Groucho Marx, Rodney Dangerfield, Jack Nicholson, and more. This would mean he knew about the 20th century... which pushes the story even further into the future...
The "magical" items are actually super advanced technology
The magical carpet is actually not magical at all... it's simply new hover technology that has been hidden in the Cave of Wonders... likely to keep it safe from the coming nuclear war that had turned the world into a bleak desert.
And taking this directly from disneytheory:
Similarly, Iago isn’t just another anthropomorphic Disney character. He’s either the result of a society so obsessed with its pets they developed technology to understand their animal’s every thought (why anyone would want these thought expressed in the voice of Gilbert Godfrey is another question entirely) or a mutation caused by nuclear fallout (slightly more likely, assuming that as the daughter of a Sultan, Jasmine would almost certainly get a translator to understand her beloved tiger Rajah).
Agrabah isn't a real place in the Middle East, obviously. However, it's assumed that this is some form of future combination of Egypt, Arabia, and Afghanistan. In the post-apocalyptic waste, the specific nation states and countries are pretty much irrelevant.
People who believe in this theory have also gone to the Aladdin videogame for more evidence. Finding bones of the dead people who didn't survive the nuclear war, buried 20th Century road signs, and even unexploded nuclear devices in the games helps support this futurist theory.
Check it out (also, this was like the best video game ever... fyi):
The only way to explain the giant golden Nintendo Wii in the movie is through this theory
Do you believe it now?!?!
Okay, this theory is sort of crazy, but like... yeah.