"Windows is doomed" doesn't mean windows is going away. As long as its market is stagnant and it isn't picking up new domains while it's competitors (linux, OS X, android) are, it becomes just a piece of legacy technology that has to stick around but isn't going anywhere. There are very good reasons why Windows tried going with mobile, IoT, and AR/MR for its future growth.

"Doomed" means a slow eventual death, not an immediate one. This reminds me of how people were so busy knocking down strawmen with the whole post-PC thing.