The commoners will ask > "Linux? Distro? What are those?!!"
How many businesses will consider switching to a Linux distro let alone a different Office suite due to costs of employee and IT training alone, especially in the present condition of economies?
Even if a few Linux distros catch on, will they be free forever? I doubt that. Nor these free Office suites. Not unless one sells hardware along with like Apple, advertising involved such as the likes of Google's Android, or diversity such as MS. Don't forget their stores and services. All three have them to some extent.
No, personally I don't see it happening any time soon.
And oh! Don't forget the situations like the Munich fiasco.