This is either not going to happen or will be a disaster.
iTunes faces a very specific threat: Spotify. The streaming model they've pioneered is clearly superior to iTunes' download model.
How would buying Beats help Apple counter that threat? With some independent brand selling headphones and operating a mediocre streaming service on the side?
That seems like such a confused model. If the threat is Spotify, they should go after them directly.
After all, you need to consider what the point of iTunes even is. Why does Apple even operate a music service? The reason is clear: to provide their hardware customers with a superior music service to anything they can get on other platforms. That's why iTunes only works with iPods, and not other MP3 players even though the music files are DRM-free.
Moving music services in to the cloud levels the playing field quite a lot. How does Apple continue to give Mac and iOS customers a better music experience than those on other platforms?
- If they bought Spotify, making the whole service platform-exclusive would annoy a lot of people. However, Apple might be able to deliver a superior experience with lower prices (bundled with iCloud?), a more permissive free tier for iOS devices, and higher quality audio for their own devices.
- If they bought Beats, things are messy. Headphones can't be device-exclusive since they go through the 3.5mm jack, so they don't help iTunes maintain relevance or help iOS/Mac devices be the best audio machines. The Beats service could be made platform-exclusive more easily than Spotify could, but then you're creating a little Apple-island and cutting off the social side of music that Spotify does so well. Apple would be competing against the cross-platform and more widely available Spotify, and would have a really hard time convincing anybody to switch. In my opinion, they will not win that fight.