I think that was the point though. If Harry had Parker blood then I think he would've been cured and not turned into the Goblin... Another thing is, and I might be alone in this, but I don't think Norman is really dead... I refuse to believe that we'll get a Spiderman with no Norman Osborn. I think it's more likely that we'll see the inverse of the Raimi films. Where as Norman was Goblin before Harry, I think that in this one, we'll see Harry as Goblin then Norman... At least I hope we see Norman Goblin.
This scene was cut from the film.
Between them having a high profile actor like chris cooper, the laser that was scanning his bed and the head, they arent done with the character.