Scott, I would still call it a slow fading
I remember the rate at which V1 faded in feb 2003 - and this is a SLOW fader - if that is fading from mag 4-5 max brightness from sunday (EDIT: as i saw many estimates at - i know some were saying mag - 6 but the majority were saying -4 or 5) then I would suggest that those estimates were too conservative - it is still brighter than/equal to venus imo, and i am not exactly new to comet estimates, altho not of this nature/type of course, not many have seen something like this, not many references, even if it fades to a MERE 0 or +2 mag when in dark skies - with a nearly as bright and big tail, there is certainly nothing to be worried about as far as a spectacle is concerned.