Considering people on pservers could literally walk through heroic raids with zero effort, no, no content difficulty will not be where it should be, because pretty much every pserver was made harder than blizzard’s versions of raids or dungeons and even the SoM bosses.
To give you even further insight into wotlk’s “difficulty”, please bear in mind that a massive portion of pserver players have the same IQ as illidan and ragnaros players.