Uhh..I don't know.
On one hand, this seems not too bad of an idea (I think I might even have thrown it out there myself at some point during the whole "do we need an ingame parser" debate)...but I always thought of it as optional at most.
As in, a pf party may check that as a requirement to join them or something like that.

Then again, that was right when SSS got released and I thought it required the actual dps needed in the fight. SSS is set to a higher requirement though, since it accounts for having to do mechanics, evade aoes, etc. in the actual fight.
But what about people that can keep their dps up very well in the actual fight but do not have a big increase when they get to hit an unmoving target without any mechanics? What about healers, whose performance is completely unrelated to the amount of DMG they can deal over the course of 3 minutes (because if every DPS player meets their DPS check, NO healer DPS whatsoever is needed, just sayin')?