Not quite as excellent for people of the appropriate level range that can't do the world bosses because they are on farm by level 50's.
Not that I mind either way as it doesn't really concern me but its the reason most MMO's make grey mobs drop nothing.
the stuff that drops from them is useless at 50 AND useless for farming to sell since you can get more by running high end content anyway. I cant imagine any 50 wasting his time traveling around, esp with bosses on timers as they are... farmable? yeah but waste of time.
So the whole point 'might' be running it for/with some lower lvl people for achievent feeling or twink gear but as i said, pointless.