I don't totally disagree with the points you and Lew made but without a few star white QBs at the centre of the sport - whether loved or hated just as long as they are there - the NFL's usefulness as "the most effective messenger of the agenda" would evaporate. Promoting the Cultural Marxist agenda through the NBA is kind of pointless today because few whites follow it. The NFL is different. For now the NFL is the last form of truly mass live entertainment in an otherwise fragmented popular culture they can utilise for their own nefarious purposes. Maybe I'm wrong. Maybe the CMs and their money-grubbing corporate allies feel the whites are so passive and/or demoralised now that they can move onto a great white-free NFL future without losing revenue but my guess is it is too soon for that.
On Favre there probably was an anti-white element to it. But the media loved the annual "will he retire" and its sequel "will he come out of retirement" stories whether they were pro or anti-Favre as it was a subject their readers/listeners/watchers also found interesting. The fans don't care about similar questions about linebackers or running backs as the QB is the main focus of interest.
Possibly. But even this year's almost entirely White-free draft (with no prominent White QBs) didn't seem to dim the ardor of the ever faithful DWFs.
The league -- and societal elites in general -- keep ratcheting up the anti-White agenda. So far there's some murmuring and muttering but no real signs of a genuine pushback, and until that comes the agenda will continue to be pushed hard.
I don't think the goal is to entirely replace White QBs, perhaps make the position look much more like the two other positions Whites are still allowed to play: tight end and offensive lineman, where the breakdown is roughly equal numbers of black and white starters.