The problem with “the market will sort itself” takes like this is that the market is not as efficient and elastic as we ideally hope. It, first of all, assumes

The problem with “the market will sort itself” takes like this is that the market is not as efficient and elastic as we ideally hope. It, first of all, assumes that everyone has the ability and knowledge to pick the operating system that is best for them. Things like marketing, personally critical (but platform dependent) software (as the other child comment says), market share, and previously formed platform comfort all influence the decisions that users and developers make regarding OS. Not to mention that possibility that someone needs to use two different operating systems for two different tasks. If everyone at once decided that they were no longer using windows, it’s not controversial that there would at least still be a massive amount of work and time to shift every legacy on windows to another platform. Even in this most extreme example of the market shifting, windows still has the security issues for the transition timeframe that the market alone can’t solve.