If the corrective wave 4 is concluded, and it looks like it is, the target for BTCUSD is minimum $6000.
If the correction is not over, then what is wave 4 for now, will become wave A, and we'll see wave C going below $3000, then wave 5 will proceed with slightly lower target.
The structure of BTC movement during last years is perfect, textbook Elliott Wave.
Wave 5, that Sheba Jafari of Goldman Sachs was referring to was only the internal wave of wave 3 visible above. CNBC also reported on her analysis on Mon, 14 Aug 2017. You can check it out.
Here I present the bigger picture of what she was talking about.