I think it works both ways.
Deckard at the end of any version of the movie might not know if he is a replicant or not.
Because we know that memories can be implanted. By implication memories can be copied.
In the directors cut Deckard gets told by Gaf via the origami unicorn "I know your memories/dreams..." If Deckard is a replicant, he is running for his life, if he isn't a replicant he is running to protect Rachael, the difference doesn't change his actions. The original release doesn't really rule this out (at least I don't remember it ruling it out) since it is narrated by Deckard himself...
The point is, in the directors cut at least Deckard no longer knows if he is a replicant or a human who has had his memories copied and shared on the police departments facebook page.
I also remember seeing some story boards of Roy after killing who he thinks is tyrell finding a room with the originals tyrells tomb since he died years ago and has cloned himself. In my mind the whole point of any of the cuts is that humanity itself is being replicated opening up the question of "immortality".
Deckard acts like a cold hearted killer, pretty much assaults/takes advantage of Racael, seems like he himself is pretty immature having self control issues and acting on urges. Also some of the cut scenes like when he goes to see Holden (you can find it on youtube i think), holden seems to look at him funny when he doesn't understand why he has been asked to press the button "for the pain asshole".
Much like a certain Roy Batty who is willing to kill to protect his friends but hasn't learned to control his anger... Seems like both are willing to protect some people whilst not care about others. The lines between human/replicant are very blurred in any case...I have always held sympathy with Roy because of this. Yes he is a psychopath, but not without reason. And kind of thought he showed more humanity than Deckard, precisely because he is fighting for his friends, whereas Deckard is willing to kill because he is told to. But also once it has become pointless to kill Deckard once all his friends are dead and he will die too anyway he saves Deckard, he didn't need to, showing compassion for his enemies.
There re so many questions that there is plenty of room for a sequel.Perhaps the original Deckard is indeed living off world after retiring...Seeing as he is "the best" perhaps he will be hired to hunt himself down. Maybe there is an aged human Roy running around blowing away replicants with a shotgun.... Quite frankly I'd wet myself if that happened...Even if the film turned out to pants, I'd put it in my Rutger Hauer collection right next to Split Second.