No.
After Microsoft was defeated in the spinning round disc wars between Blu-ray and HD DVD, the Blu-ray format went on to having a 3D version and a 4K version, both of which would have been technically impossible with the HD DVD specification
After Microsoft was defeated in the mobile phone wars by the combined forces of Apple and Google, the modern capacitive touch screen smartphone pioneered by the original iPhone became the most important technology product in human history and changed everything about society, culture, and economics from how things were before
Every time a market is freed from Microsoft, it becomes more free, more vibrant, more innovative, and more joyful. If Steam OS could free PC gamers from Microsoft, a similar revolution could occur there too