Then why would anyone build native applications when Windows apps would be WORA? The only incentive I see for Apple is that they are in many ways a hardware company first. They want to sell hardware and this is one reason they haven't feared bootcanp.
Years ago I saw a demo of a Windows subsystem running an ELF Apache server directly on Windows NT. It isn't anything that Microsoft would release though, because once you make it so Windows can run Linux applications, who is going to write Windows apps? It erodes the platform.
I see an official WINE for OSX, that has a perfectly working subsystem, introducing the same problems to that ecosystem.
