At the end of the day the PL is firmly in the pockets of the broadcasters and as far as global broadcasting revenue is concerned and without even looking up the figures I'm willing to bet that, regardless of how shit they've been in recent years, united are still far and away the biggest (English) global revenue generators for said broadcasters.
Sadly still true. Man Utd are in decline but they evoke strong feeling because of their past. I watched West Ham v Leeds at the weekend. Completely boring because I had no stake in the game. When Man Utd are on one either wants them to win, or lose, one is rarely not bothered. For ITV for example, their viewing figures are absolutely vital as far as advertising is concerned.
I don't have any data but I strongly suspect that the 3 most popular clubs in England are Liverpool, Man Utd and Manchester City. Liverpool fans wont admit it but we know from the sheer volume of articles about Manchester City in the Echo and in their social media that they hate us, as much as we hate them, if not more so.
It will take a very long time, perhaps a lifetime for diehard City and Liverpool fans to switch off from Man Utd and no longer regard them as the enemy. New rivals emerge but you can't stop wanting Man Utd to get beat. My attitude towards them has changed. I used to see a Man Utd shirt and have to bite my tongue for fear of saying something stupid. I'd go into the newspaper section of a supermarket, and put all the Man Utd magazines at the bottom of the stack. Now I see their shirts, and my first emotion is laughter. I see a Liverpool shirt and I grimace. But Utd still evoke interest. This will die slowly. It will probably die with my generation.
We know City are taking a slice of the national media cake because we are always in the news. Usually bad news, and that's because media executives know that if they can portray Manchester City in a bad light, then Liverpool fans will pay for it. Man Utd fans are not even looking at the papers at the moment.