Are self destructing."
Well you might well be right but then again the haters have been predicting (hoping!) this would happen for twenty years or more.
You say Open Office formats are blossoming. In business I come across Office Open XML formats everywhere, not so much Open Office formats. Personally, I would miss modern versions of MS Office. The alternative seems to be use Open/Libre Office and use a UI from the 90's or use a cut down web based product like Google Docs. I don't find either prospect particularly appealing :(