LOL. In my opinion I think there are no final price for Bitcoin cause it'll never die and it'll keep increasing all of its life, sometime it can be dump a little bit but it'll rise back right after that (always the same all the time right at the start). It can be 100k$ 500k$ or maybe even 1m$ 
) Don't really know about it but it'll keep increasing until something will happen and make it stop and stand stable all the time )
The question itself sounds like a joke , as bitcoin is decentralized which everything depends on us who have full control over the money.) Don't really know about it but it'll keep increasing until something will happen and make it stop and stand stable all the time )When a lot of people agree to sell their bitcoin at the same time the price will get dropped and vice versa.
The fixed price might will never happened because its decentalized , statistically bitcoin always increasing time after time.