The very end another dream?

The ending dint make any sense at all.

doesn't need a sequel

This is my take on the ending:

When she's calling out to be woken up, Freddy says something along the lines of, "I needed to keep you awake long enough so that you'd never wake up again," and then, "Did you really think your boyfriend could wake you up?" This whole scene is apart of her final dream. Freddy already killed her boyfriend, we see this, and when he 'comes back' his wounds are different than the ones he incurred in reality. And her seeing the syringe come down just as Freddy comes down with his blades are a part of the dream. And their battle is also a part of the dream. And her 'victory' is also a part of the dream...or I should say nightmare.

She never wakes up, and Freddy goes on torturing her in this final nightmare for all of eternity.

Pretty chilling, for me at least.

"Buy the ticket, take the ride." --Raoul Duke, the great shark hunter

it's just a nod to the ending of the original. kill the mom with a final "gotcha" moment.

I would say it goes like this:

The final confrontation between Nancy and Freddy was not a dream. She really did bring him into the real world and killed him there.

The only reason why people believe that this is still a dream is because that's a pretty popular theory for the original movie (which really is a bit hard to understand, unlike the ending in the remake) and so, they just automatically apply the same logic to the remake.

But this time, there's really no reason to doubt that she actually brought him into the real world.

The very last scene, where the mother is pulled through the mirror, well that was of course a dream again. This dream could have happened anywhere. Maybe Nancy fell asleep in the car and dreamed it. Or maybe she got home normally, went to sleep and then dreamed of getting home again.
It's not even clear if the mother was really killed, i.e. if she was in the dream too, or if this was just a joke by Freddy and she was merely an image.