Besides that's not going to happen,
(long elaborated explanation spared, in which commercial, proprietary software is only one point)
why?
Don't get me wrong: Personally I hate Windows since my first contact with 95. And I'm very happy I finally got myself into a position I can live without Windows, and use FreeBSD exclusively, since Windows 7. But I'm also realistic enough to see I cannot speak for anybody else, especially not everybody.
Many people do the same mistake over and over again, judge others by their own standards. So many open source users/developers don't see the majority of people is simply not that interested in computers. They have to use them for job and entertainment, but they are absolutely not really interested in them. And you need to be at least a tiny bit interested to get even the idea asking for alternatives, yet not speaking of change.
Most people just want watch movies, and surf the internet. They don't even care which player, or browser they use, don't even know there are others than the default installed one. Many don't have the slightest idea what an 'operating system' is. They use a computer. End of story.
Neither FreeBSD nor Linux are ment to be the easy-fun turn-key OS for uninterested users. There are several Linux and some (Free)BSD derived 'distris', trying that, and again I spare me long elaborated thoughts why this can have only limited success.
It's a good thing if you're happy with free open source operating systems. Welcome! One self brain user more. One more for the team of alternatives, and more freedom.
But just because you see their benefits, can handle, and enjoy them shouldn't lead you to a deduction to transform the world.
BSD and Linux distros competing
Why?
Why there always must be competition?
Why still this dinosaur attidude?
Why different things cannot simply stay side by side in peace, each is doing what it thinks is best, leave the others alone, and anybody can decide for her- or himself what suits best?
Yes, of course this may result in one may have to face what was created is not beloved applauded as the genius as one sees it oneself, maybe because it's a bit too special, maybe because of others are still not mature enough for it yet, or maybe even because it actually sucks. This way one cannot get away with it easily by just blaming others. That's called self-responsibility.
One can see what just the Linux internal competition only has made of it. Especially when things get out of hands. Lots of energy useless wasted for fighting over each other.
To me that's not desirable.