And this is good for users how?
They are working together to develop a solution.
Arguments about which is better, DropBox or iCloud, are a moot point. DropBox is a great service which many iOS users use, it has significantly enhanced many iOS apps.
It's great Apple is improving iCloud, but DropBox is also cross-platform which is really helpful to me. In the end hopefully the market will decide, and developers will be able to choose which to offer support for.
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I use both and Dropbox is a poor man's solution. They scraped iDisk because they realized the same thing.
Why is it a poor man's solution? Everyone has different needs and DropBox is a great solution for many people.
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It competes with iCloud, so that is a big no no thru Apple
But that's not why these apps are being rejected. They are being rejected only because of the in-app purchase thing.
DropBox is changing the SDK and working with Apple to come up with a good solution, and I think this problem goes away soon.
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Gone in 2 years? I HIGHLY doubt that!
I highly doubt it too. If anything, some bigger company might buy them out (like Apple originally wanted to).
I think the service has developed a lot of traction with many of its active users. Not only do I use my DropBox across both Mac and PC's, I use it in conjunction with many iOS apps. So to just switch overnight to another service is not something I could do lightly, I would have to be seriously dissatisfied with DropBox or REALLY want to use some other service.