This discussion inspired me to go research some old PC focused magazines from the 80s and 90s to try and pinpoint the exact moment decline began. I've come to a predictably unpopular conclusion. Decline began with a game that has four letter in the title and starts with a D.
Yes, I know, it's one of the best games of all time, blah, blah, blah. That doesn't matter. You look at PC gaming coverage prior to Doom and it was legitimately and unironically monocled. It wasn't trying to be elitist or sound smart, it was written by a well educated individual addressing his or her peers. Respect for the readers intelligence and horizontal identification are present in every line.
Less than 6 months after the Doom explosion, PC gaming coverage is completely different. It's now talking to teenagers, or morons, or both. Everything starts sounding like PR talk, and if you listen closely to the spaces between each printed word you can actually hear the wheels of the hype machine start to spin faster and faster. Clearly and unequivocally Doom's success ruined PC gaming.
I understand this isn't what any of you want to hear. But trust me, it's the truth.