Mmmmm I think it's still an important point to be made. The argument isn't "some policy teams still win," it's "traditional powerhouses are still powerhouses." Emporia's crowns, the OU/Towson round...these are more noise than signal.
I mean, look at the regular season (since that was when the majority of the "backlash" activity took place):
GSU finals = Harvard d. Northwestern
Kentucky = Northwestern d. Michigan
Harvard = Northwestern d. Georgetown
USC = Harvard d. Cal
CSUF = Northwestern d. Towson
Texas = Gtown d. Wake Forest
Now, granted, Harvard BoSu and Cal MS were dirty K debaters, but you'd be hard pressed to defend that Harvard and Cal don't count as part of the old guard. There are probably also pretty good args that the kind of academic criticism they engage in are typical of and reify White scholarship. I would consider Wake as a school to be part of it too, but Wake LW is an exception to that rule.
So, out of 7 majors, that's what? 4 won by Northwestern, 1 by Gtown, and 1 by Harvard. 2 Black/non-traditional teams in finals (not totally sure how best to describe Wake LW) out of a possible 14.
If we expand it to semis, then out of 28 possible slots available, Black teams accounted for only 5 (Towson, Wake, Rutgers, OU, and West Georgia each reached semis or better exactly once) of those. ~18%.
Factor in CEDA (all Black everything) and the NDT (Gtown d. Michigan) and you have Black teams this year winning 1 out of 9 majors, claiming 4 out of the possible 18 spots (~22%) in the finals, and claiming 9 out of 36 (~25%) of semis spots.
Now, you can look at these results, and draw many different conclusions. Maybe this reflects a bias in the judging pool against Black teams. Maybe this shows a fundamental flaw with MPJ. Maybe this shows that if the traditional schools had turned up in force at CEDA, the outrounds would have been shaken up from the influx of policy judges they brought with them.
But you know what it doesn't show? That Black teams have been successful to the point that traditional powerhouses are feeling threatened. Yeah, Hardy tried to start his own tournament, but that's one dude. If Northwestern, Harvard, Gtown, Michigan, MSU, Kansas, Emory, Wake, Mary Wash, Dartmouth, Kentucky, Cal, and Iowa all really were unwilling to cede literally any ground to Towson, OU, Rutgers, West Georgia, Vermont, and Fresno St, then every tournament would either be like the NOPD (policy-only) or CEDA ("we won't dignify the tournament by coming").
For gods sakes, the PRL was floated, and nobody wanted to do it.