It appears that NFL players are no longer taking a knee during the national anthem, namely because none of the teams with still-active protesters has qualified for the postseason.
By the end of the regular season, only five teams featured at least one player regularly sitting or kneeling on the sidelines for the anthem: the Seattle Seahawks, the San Francisco 49ers, the Miami Dolphins, the New York Giants and the Oakland Raiders.
None of those franchises made the playoffs, even though four of the five did so in the previous season, leading to speculation about whether the take-a-knee protests wound up dragging down team performance along with TV ratings.
https://www.washingtontimes.com/news/2018/jan/15/nfls-kneeling-protesters-miss-playoffs/
