I think this is horrible.
1. Apple has a history of not spending a ton of money on acquisitions. That isn't to say they might not (I'm holding my breathe on buying Google or Facebook although that is also unlikely).
2. iCloud is not the same as AWS. Apple has not expressed any intentions of going into the hosting business and it certainly doesn't support what they do or what iCloud is designed for. The backend might be good structure but the business models are sooooo different, I'm surprise this was even mentioned (albeit I'll admit that AWS is a solid business).
3. The argument of Apple gaining digital content as a plus is wrong. Apple had numerous opportunities in the past to buy out Music companies and record labels and probably entertainment and production studios as well (even Pixar and Disney which Jobs is part of) but didn't. Apple doesn't need to "own" the content for them to reign as king. Didn't happened then, less likely to happen now.
4. Bezos is great, but he's no Jobs. He understand even less about hardware (only experience being Kindle) or desktop applications. Apple's core business is primarily desktop applications and heavy on hardware. Bezos would be a bad fit when you consider this.
Your third benefit is why it would get blocked on anti-trust grounds.
Will not happen.
Very interesting idea. However, Apple and Amazon have very distinct ways of doing business that would stop any potential purchase talks dead in their tracks.
1) Apple makes and sells everything itself at very high profit margins. They also work with some retailers to extend reach. Meanwhile, Amazon makes nothing (except the Kindle) and sells millions (billions?) of small items at a miniscule profit margin. Completely different models here.
2) Apple is notorious for not trusting other parties to do their business. Amazon depends entirely on it.
3) The parts of Amazon that overlap into Apple's interests -- digital content and AWS -- are irrelevant. Apple already has a huge content distribution channel, and does not need the help of Amazon's agreements with creators. AWS could be intriguing, but if Apple thought AWS was worth using, they'd already use it for iCloud, iTunes, etc.
While Apple and Amazon are two of my favorite companies in the world, I see very little that would give way to a potential acquisition.