I wouldn't go that far, simply preventing the existence of the Xbox would be enough.
Do you seriously believe a
monopoly is prefered? Two corporations, and they will both be shackled by public perception, neither able to escalate their greed-driven anti-consumer practices without losing marketshares to the competitor.
If either Xbox or PS died, what prevents the other from going to AA/AAA developers and telling them: "If you port to PC, we will remove you from our store and you can kiss 70% of your income goodbye."
Or just outright bribe them! Regardless, bye-bye Steam Catalogue. I hope you like indies and Chinese MMOs.
"But surely PC-only developers and multi-platform publishers with integrity (lol) will stay!"
Not for long - their income would slowly fade away as the remaining Console-Goliath steal PC gamers away with promises of overproduced exclusives.
You must be into cuckolding, because PC gaming as we know it would die within the decade.
But if you've dived so deep into apologism that you prefer your PS4 still, think about what Sony would do to their own ecosystem once their consumers have nothing to replace it with. (Hint: Comcast was once popular.)
Developers have to pay $10'000 for releasing a patch? How about $30'000.
Users have to pay $10/month for online play? How about $20.
You can't pay the (increased) entry fee for publishing a game and they don't see enough (market)potential in it to make an exception? Bad luck.