It baffles me how, even if DHB is the #2 WR, you think Hilton will produce much worse this year (even if he stays as the #3).
Did this actually happen? Taking a quick look through, I saw one guy projecting Hilton for slightly lower numbers than last year (presumably because he thinks DHB is better than Avery, and the offense might slow down a tick from its legendary pace), a whole bunch of people saying that yes, Hilton would be better, but maybe not so much better that he's worth where he's being drafted, and a handful of people who think he's a top five overall WR.
The discussion, thus, doesn't really seem to be DHB versus Hilton. It's how DHB's presence and role effect Hilton, and thus Hilton versus the WR's who are getting drafted around him. Like the guy below said, it's more Hilton vs. Austin (either one), Boldin, Jennings, Stevie J, etc. Because that's whose production you're passing on if you take Hilton instead. And if you're confident he'll be a top 10 overall type receiver, presumably you're not risking having him fall to you at his ADP, so it's Hilton versus Desean, Garcon, Steve Smith, etc. for you guys.
In either scenario, you're not passing on DHB to take Hilton -- you can just take him for free.