I think the parent commenter was merely stating that a large portion of Office users realize that what they're doing isn't "serious" - despite it being critical to their uses, it's something that doesn't require the full power of a desktop Office suite (and thus can be done without Microsoft).

Fact is, even Surface won't be as mobile as something that fits in your pocket - and I seriously doubt Microsoft can or even wants to make (perhaps a stripped down) Office into a $10 smartphone app.