I will just say this. All speculation about the prices going over 1000$, are pure speculation and very less possible. If it was so, I am sure people would be hoarding bitcoins right now, for that 500% profit in less than 2 years.
I think the price would depends on wha the price was before halving. It would certainly increase, but hard to say by what amount.
I think that's a good point about the price depending on what it was before the halving. We don't know if the bottom's in yet and if it drops a lot more then the price after halving might be lower than it is now.