I found that autocorrect was intrusive and would interrupt my flow of words. The final straw was a few emails where I fought with it to get the word I wanted. I could have hit the X to cancel a change, but this required attention and it seemed hard to click in the right spot. It's easier to look for red underlines before I send an email.
Microsoft lives from taking users' documents hostage and making users pay for software upgrades, so they won't do it. OOo/Libre Office does not seem to have the man power to do it. Apple seems to be utterly unmotivated to anything more than absolutely necessery with its office suite.
That said, there are interesting alternatives out there if you are willing to part with more than basic *.docx compatibility.
I think there can be improvement for keyboards inspired by touchscreen keyboards, but it's going to be different then what's out there on phones and tablets because of the differences in how we type between the two. We don't touch type on mobile devices.
I think the only thing free when typing is our thumbs..
The reason that technology exists is because we're so bad at tapping small rectangles with our thumbs. If you interacted with your smartphone using a full size touch-typing keyboard, the phone wouldn't have advanced autocorrect.
http://googledocs.blogspot.com/2012/03/spell-checking-powere...