My feeling is that Windows 10 (which does not make me happy as a name) will likely be a make it or break it moment for Windows. Mac OSX and Linux are taking Windows to task big time but people are mostly playing a waiting game to see what Microsoft will do with their upcoming release. They are giving them a chance to course correct now that Ballmer is out on his ear. Can Microsoft turn things around with someone new at the helm? Or will they continue to steer into the iceberg?
Windows 10 appears to be well situated to have a good recovery trajectory for Microsoft. But we will just have to wait and see. If they botch this like they did with Windows 8, they are going to lose market share very quickly. I think that they have to make this work.