A few things I'm not getting:
Firstly, how is this a model geared at businesses if it forces you to put your files on a MS server (at least for the iPad version)? As a businessman I would never allow my company's files to be stored off-site.
Secondly I keep hearing that MS Office has so many more features than its competitors and so is justified in being more costly. I can see that for Excel on the desktop (VBA, conditional formatting, locking/unlocking specific cells, SQL refresh). But since the iPad version doesn't have them, where is the added value?
Thirdly, I'm sure MS will keep innovating Office if only to keep their edge over their free competitors (if it exists) and can deploy feature enhancements rather than major versions. Sadly this negates one of the big other points in favour of MS Office: its tried and tested stability.
Lastly: What will I do with all my Office files once MS is no more? In my standalone version I will be able to keep using them, but O365 might stop working pretty abruptly. That can never happen, you say. I'd say, bigger giants have fallen and those were times that were not nearly so economically unstable as the current US and world economy. Most of us will once live in a post-Microsoft, post-Google and, yes, post-Apple world.