Now most students are being trained to use Office at school.

I use to see the world from an "Open Source" programmer's point of view: "You have the choice to use OpenOffice". But then after I saw the reality for a while, things start to sink in and it becomes obvious that people don't want to be liberated the way I thought they ought to be.

People are OK with MS Office. It becomes a piece of software that, no matter how hard geeks want to argue about the Pareto Principle or not, will stood the test because people were being trained regardless its complexity.

So yeah, from "feature/functionality" perspective, there are alternative. But from skill-wise, willing-to-learn aspect, there aren't until Universities and/or schools start teaching young people to use something else.

OTOH another argument is: you don't need the other alternatives if you have Office.