As others have noted, the primetime games have largely stunk, both Monday night games and Thursday ones. Sunday night games are solid, but viewers are often over-saturated by that point after watching the earlier games and perhaps college the day before, too. It seems like the NFL should try to make Monday, and, to a lesser extent, Thursday the penultimate primetime slots for the best games (though Thursday games are often sloppy due to the short turnaround.)
One point no one has mentioned is the continued rising cost of Sunday Ticket. I've had this for years (over a decade now), and it goes up every year without fail. I think this year the full price for Max Ticket was close to $400 (I got a discounted rate, as usual, so I don't know the exact price), but even paying a discounted rate is getting harder to justify, and while I'm far from rich I do have some expendable income, but how much do I really want to pay for extra games? I think, at this point in my life, watching the best college games on Saturday, which are always free, and one or two Sunday games is enough. I might cancel Sunday Ticket next year regardless of how big the discount is.