1) Libre/OpenOffice was never satisfactory. It is ugly and crashes. Tried many times using it since 1999 and it gets worse and worse. Pity, because StarOffice was a perfectly usable alternative back then.
2) Office-like products are addictive in corporate environment. People love to make ramsom-note style documents and presentations. An old typewritten document seems way more professional in direct comparison... People add so many 'hairs' in documents that not even Office365 can open them anymore, so you have to resort to native MS-Office. And sometimes it must even be the Windows version, because the Mac version does things a little differently and messes up a really complicated document. (The second last version for Mac consistently broke when review mode and table changes were mixed, and I worked in an environment where review mode was extensively employed.)
Any migration away from Windows would have to tackle these problems before even the operating system. The rest of the desktop UI is ok in Linux - people use mostly the browser anyway. Google Docs is an option - no documents more complicated than GDocs can handle should be allowed.
I actually preferred the documents were all generated, either by software, or at least using markup like HTML or LaTeX, that are diff'able. But I know this is impossible to impose on the layman.