With the fantasy playoffs here in most formats, the last thing you want to be doing is hitting the waiver wire or seeing your stars down. The opposite is true for NFL franchises and fantasy owners—they'd much rather see players coming back or better, never having been down at all.
At this stage in the season, players are all fatigued at some level. We're seeing the result of that, both in-game, week-to-week and in-season. Injuries tend to be front-loaded for a season, but the survivor effect tends to diminish, leaving only the elite performers at this point in the game.
This is a tough one to figure out for a lot of fans, but "fatigue" is not one thing. Fatigue is a multifunction, multipoint systemic fault that has to be corrected for. There's no more time in the day for the medical staff to deal with these things now, but like compound interest, the things they were able to do earlier in the season, with prevention or maintenance programs, now pay off.
If you made it this far, you're better than most players. It's no time to let up now. Information is the power and currency of fantasy sports, to paraphrase Billy Idol. Use it wisely. In the meantime, let's look around the league...