As Android and iOS go to become the #1 and #2 platforms in the future, I don't see Office remaining that relevant in the future, even if they port it to those platforms.
Applying the "death of the PC" mantra to all things gets old. Things like multi-tasking, having access to a filesystem, embedding different types of documents is a "feature" that is really useful to people doing actual work.
One of my duties a couple of years ago was doing budgeting and rate-setting for a $50M IT business. A rich spreadsheet like Excel was an essential part of the that process, and there is no replacement platform out there that is going to replace that category of app. (You may be able substitute LibreOffice or something.)
"As Android and iOS go to become the #1 and #2 platforms in the future"
+1
And not only that: there's a massive shit to webapps and more and more people are using GMail. The day a (basic) Excel user discovers Google Docs spreadsheet and realize he can share a spreadsheet either read-only or read-write with another GMail user is the day he stops using Excel.
I do certainly see Google spreadsheets gaining lots of traction against SMEs and independent contractors and, horror, I do even know people making very very good looking documents using non-Excel and non-Google spreadsheets on Mac! (heresy for anyone on HN apparently).
Zero Excel spreadsheets here. Tens (if not hundreds) of Google Docs spreadsheets and most weren't created by me but shared with me.
