Such a model would create an amazing marketing opportunity for a Linux based OS. Instead of paying an annoying monthly subscription you get a free office system built in. Not including such basic functionality with the OS is like selling a phone without batteries. Suddenly Linux becomes a premium product with lots of high quality software included compared to the annoying app store you get with Windows.
In other words, it would force all the people currently pirating Windows and Office to actually decide between the products on offer based on their previously-merely-nominal market positions. (Which is, indeed, what Creative Cloud has done for Adobe.)
