Agree with you...
price after 2016 will be 900$ and not more, and you ask to explain, well it will be worth 900$ because of halving and what will happen before/after it, price rises now before halving because people buys lots of bitcoins, and halving will rise price even more
Or it could stay in the $500-600 mark.
Theres no way to tell that prices can hold very long unless its the new median price after its been that way for 6 months.