Then, as a bit of a tangent:
Windows only has a "monopoly" on PC gaming because Apple refuses to licence their operating system for non-Apple hardware - and because Linux just isn't mainstream enough.
If you could buy OSX just like you can buy Windows and install it on your home built PC, I'm confident the landscape would at least be somewhat different.
(It is certainly possible to install osx yourself on your own PC hardware, if you put your pirate hat on and are happy with massively outdated GPU drivers etc - or at least it was half a decade ago when I checked last).
Of course Apple would also have to develop some care for gamers.