In my words. (Possible dollar collapse not taken into account).
- Summer 2015 up to ~$700
- Autumn/Winter 2015 down to ~$400
- Througout 2016 stable as fuck at around ~$400
- Winter/Spring 2017 next rise to ~$2700
- Summer 2017~ $2000
Time and price can deviate from here

(worldwide adoption/use cases found)
- Summer 2018 ~ $14000
- Autumn 2018 ~ $4000
- Summer 2020 ~$67000
- 2021 to 2024 ~ $20000
For all we know the next bubble could just go right to $40k or something and not come back down due to manipulation who knows for sure. If some big guys get involved and they need the price higher and stable for reasons beyond just playing dice games and buying pizzas it could happen.